A responsibility matrix clarifies the division of responsibilities between the cloud service provider (CSP) and the customer, ensuring that each party understands and implements their respective security controls.
References: Security+ SY0-701 Course Content.

The best first step is to reviewpatching (A). Outdated OS versions often contain vulnerabilities that can be exploited by malware. Ensuring systems are up-to-date is a foundational cybersecurity practice.
This is highlighted inDomain 2.1: Given a scenario, analyze indicators of malicious activityandDomain 2.2, emphasizing the importance of"Patching" as part of system hardening and mitigation strategy.
Reference: CompTIA Security+ SY0-701 Objectives, Domain 2.2 - "Mitigation techniques: Patching."

The correct answer is Compensating because a bastion host is being used as an alternative safeguard to reduce risk when a primary control cannot yet be fully implemented. In the context of the Security+ SY0-701 objectives, compensating controls are designed to provide protection when standard preventive controls are not available, effective, or feasible-such as during a zero-day exploit where no vendor patch or permanent fix exists.
A zero-day exploit represents a vulnerability that is actively being exploited before developers or vendors have released a fix. Since patching is not immediately possible, organizations must rely on compensating controls to limit exposure and reduce the likelihood or impact of exploitation. A bastion host is a hardened system placed in a network segment-often in a demilitarized zone (DMZ)-that acts as a controlled access point between untrusted and trusted networks. By routing access through this tightly secured host, the analyst reduces the attack surface and restricts direct access to internal systems that may be vulnerable to the zero-day.
Option B, Detective, is incorrect because detective controls are focused on identifying or alerting on malicious activity after it occurs, such as logging, monitoring, or intrusion detection systems. Option C, Operational, refers to processes and procedures carried out by people, such as incident response or change management, rather than a technical safeguard. Option D, Physical, applies to tangible protections like locks, cameras, or fencing, which are not relevant in this network-based scenario.
The SY0-701 study guide emphasizes the importance of layered security and adaptive risk management.
When preventive controls fail or are temporarily unavailable, compensating controls like bastion hosts, network segmentation, and access restrictions allow organizations to maintain security posture and continuity of operations while longer-term solutions are developed.

Validating the code signature is the best way to verify software authenticity, as it ensures that the software has not been tampered with and that it comes from a verified source. Code signatures are digital signatures applied by the software vendor, and validating them confirms the software's integrity and origin.References:
CompTIA Security+ SY0-701 course content and official CompTIA study resources.