The first step in the incident response process for a suspected breach is to research the validity of the alerted breach. An incident response process is a set of procedures that defines how to handle security incidents in a timely and effective manner. The first step in this process is to research the validity of the alerted breach, which means to verify whether the alert is genuine or false positive, to determine the scope and impact of the incident, and to gather relevant information for further analysis and action. Informing potentially affected customers of the security breach, notifying business management of the security breach, and engaging a third party to independently evaluate the alerted breach are also steps in the incident response process, but they are not the first step. References:
CISA Review Manual, 27th Edition, page 4251
CISA Review Questions, Answers and Explanations Database - 12 Month Subscription

Asset life cycle management is a technique of asset management where facility managers maximize the usable life of assets throughplanning, purchasing, using, maintaining, and disposing of assets1. The mainaim of assetlife cycle management is to reduce costs and increase productivity by optimizing the performance, reliability, and lifespan of assets2. Asset life cycle management can help prevent the situation of having unused applications by ensuring that the applications are aligned with the business needs, objectives, and strategies, and that they are regularly reviewed, updated, or retired as necessary3.
The other options are not as effective as asset life cycle management for preventing unused applications. A formal request for proposal (RFP) process is a method of soliciting bids from potential vendors or suppliers for a project or service. A RFP process can help select the best application for a specific requirement, but it does not ensure that the application will be used or maintained throughout its lifecycle. Business case development procedures are a set of steps that involve defining the problem, analyzing the alternatives, and proposing a solution for a project or initiative. Business case development procedures can help justify the need and value of an application, but they do not guarantee that the application will be utilized or supported after its implementation. An information asset acquisition policy is a document that outlines the rules and standards for acquiring information assets such as applications. An information asset acquisition policy can help ensure that the applications are acquired in a consistent and compliant manner, but it does not address how the applications will be managed or disposed of after their acquisition.

The answer A is correct because user activity monitoring is the most effective control to mitigate against the risk of inappropriate activity by employees. User activity monitoring (UAM) is the process of tracking and recording the actions and behaviors of users on devices, networks, or applications that belong to an organization. UAM can help to prevent, detect, and respond to insider threats, such as data theft, fraud, sabotage, or misuse of resources. UAM can also help to enforce policies, ensure compliance, and improve productivity and performance.
Some of the benefits of UAM are:
Prevention: UAM can deter employees from engaging in inappropriate activity by making them aware that their actions are monitored and recorded. UAM can also prevent unauthorized access or use of sensitive data or resources by implementing access controls, encryption, or alerts.
Detection: UAM can detect any anomalies, deviations, or violations in user activity by analyzing the data collected from various sources, such as logs, keystrokes, screenshots, or video recordings. UAM can also use artificial intelligence or machine learning to identify patterns, trends, or risks in user behavior.
Response: UAM can respond to any incidents or issues related to user activity by notifying the relevant stakeholders, such as managers, security teams, or auditors. UAM can also provide evidence or proof of user activity for investigation or remediation purposes.
Some examples of UAM tools are:
Teramind: Teramind is a cloud-based UAM platform that offers features such as user behavior analytics, risk scoring, policy enforcement, data loss prevention, and productivity optimization.
Digital Guardian: Digital Guardian is a data protection platform that offers UAM capabilities such as endpoint detection and response, data classification and tagging, and threat hunting and incident response.
XPLG: XPLG is a log management and analysis platform that offers UAM features such as log aggregation and correlation, user behavior profiling and anomaly detection, and real-time alerts and dashboards.
The other options are not as effective as option A. Two-factor authentication (option B) is a security mechanism that requires users to provide two pieces of evidence to verify their identity before accessing a system or resource. Two-factor authentication can enhance the security and privacy of user accounts, but it does not monitor or record the user activity after the authentication. Network segmentation (option C) is a technique that divides a network into smaller subnetworks based on criteria such as function, location, or security level. Network segmentation can improve the performance, security, and manageability of a network by reducing congestion, isolating threats, and enforcing policies. However, network segmentation does not track or record the user activity within each segment of the network. Access recertification (option D) is a process that verifies and validates the access rights of users to systems or resources periodically or on- demand. Access recertification can ensure that users have the appropriate level of access based on their roles and responsibilities, but it does not monitor or record the user activity with the access rights.
References:
[User Activity Monitoring: Examples and Best Practices | SEON]
Top 10 user activity monitoring tools: software features and tracking price - Dashly blog Whatis User Activity Monitoring? How It Works, Benefits, Best Practices and More - Digital Guardian What Is User Activity Monitoring? Learn the What, Why, and How - XPLG