Explanation/Reference:
Explanation:
Change management controls the process of introducing changes to systems. Failure to have good change management may introduce new weaknesses into otherwise secure systems. Patch management corrects discovered weaknesses by applying a correction to the original program code. Security metrics provide a means for measuring effectiveness. Version control is a subset of change management.

Explanation
Employees must be continually made aware of the policy and expectations of their behavior. Choice A would have little relevant bearing on the employee's behavior. Choice B does not involve the employees. Choice C could be an aspect of continual reinforcement of the security policy.

Explanation
Exploit code for one of the vulnerabilities is publicly available presents the greatest concern because it means that anyone can easily exploit the vulnerability and compromise the web application. This increases the risk of data breach, denial of service, or other malicious attacks. Therefore, exploit code for one of the vulnerabilities is publicly available is the correct answer.
References:
* https://www.imperva.com/learn/application-security/penetration-testing/
* https://www.netspi.com/blog/technical/web-application-penetration-testing/are-you-testing-your-web-appl