The CISO should first determine the extent of the impact to the organization by assessing the nature and scope of the data breach, the type and sensitivity of the data involved, the potential harm to the organization and its customers, and the legal and contractual obligations of the organization and the service provider. This will help the CISO to prioritize the appropriate actions and resources to respond to the incident and mitigate the risks. The other options are possible actions that the CISO may take after determining the impact, depending on the circumstances and the outcomes of the investigation. References = CISM Review Manual 15th Edition, page 2231; CISM Review Questions, Answers & Explanations Database - 12 Month Subscription, Question ID: 1030

The primary objective of incident triage is to categorize events based on their severity, impact, urgency, and priority. Incident triage helps the security operations center (SOC) to allocate the appropriate resources, assign the relevant roles and responsibilities, and determine the best course of action for each event. Incident triage also helps to filter out false positives, reduce noise, and focus on the most critical events that pose a threat to the organization's information security.
Coordination of communications, mitigation of vulnerabilities, and containment of threats are important tasks that are performed during the incident response process, but they are not the primary objective of incident triage. Coordination of communications ensures that the relevant stakeholders are informed and updated about the incident status, roles, actions, and outcomes. Mitigation of vulnerabilities addresses the root causes of the incident and prevents or reduces the likelihood of recurrence. Containment of threats isolates and stops the spread of the incident and minimizes the damage to the organization's assets and operations. These tasks are dependent on the outcome of the incident triage, which determines the scope, severity, and priority of the incident. References = CISM Certified Information Security Manager Study Guide, Chapter 8: Security Operations and Incident Management, page 2691; CISM Foundations: Module 4 Course, Part One: Security Operations and Incident Management2; Critical Incident Stress Management - National Interagency Fire Center3; Critical Incident Stress Management - US Forest Service4

The information security manager should first evaluate the information security laws that apply to the acquired company, as they may differ from the laws of the parent organization. This will help the information security manager to understand the legal and regulatory requirements, risks, and challenges that the acquired company faces in its operating environment. The information security manager can then determine the best approach to align the information security programs of the two entities, taking into account the different laws and regulations, as well as the business objectives and strategies of the acquisition. References = : CISM Review Manual 15th Edition, page 32.

New business initiatives are the most important consideration, as security must align with business changes to effectively protect assets and support growth.
"The security strategy must be aligned with new business initiatives to ensure it continues to protect critical assets and support enterprise goals."
- CISM Review Manual 15th Edition, Chapter 1: Information Security Governance, Section: Business Alignment* ISACA practice questions stress that aligning with new business initiatives ensures relevance and effectiveness.