The organizational risk appetite is the best indicator of the comprehensiveness of an information security strategy. The risk appetite defines the level of risk that the organization is willing to accept in pursuit of its objectives. The information security strategy should align with the risk appetite and provide a framework for managing the risks that the organization faces. An internal or external security audit can assess the effectiveness of the information security strategy, but not its comprehensiveness. A business impact analysis (BIA) can identify the critical business processes and assets that need to be protected, but not the overall scope and direction of the information security strategy. References = CISM Review Manual 2023, page 36 1; CISM Practice Quiz 2

A penetration test is a proactive way to identify and remediate security vulnerabilities in a network. When a penetration test reveals a security exposure due to a firewall that is not configured correctly, the information security manager's best course of action is to ensure a plan with milestones is developed to address the issue.
This plan should include the root cause analysis, the corrective actions, the responsible parties, the deadlines, and the verification methods. This way, the information security manager can ensure that the security exposure is resolved in a timely and effective manner, and that the firewall configuration is aligned with the security policy and the business objectives.
References =
CISM Review Manual (Digital Version), page 193: "The information security manager should ensure that a plan with milestones is developed to address the issues identified during the penetration test."

The next thing an incident response team should do after establishing that an application has been breached is to isolate the impacted systems from the rest of the network, which means disconnecting them from the internet or other network connections to prevent further spread of the attack or data exfiltration. Isolating the impacted systems can help to contain the breach and limit its impact on the organization. The other options, such as maintaining the affected systems in a forensically acceptable state, conducting a risk assessment, or informing senior management, may be done later in the incident response process, after isolating the impacted systems. References:
https://www.crowdstrike.com/cybersecurity-101/incident-response/
https://learn.microsoft.com/en-us/security/operations/incident-response-playbooks
https://www.invicti.com/blog/web-security/incident-response-steps-web-application-security/