Security Testing

Correct Answer: Compliance testing

Compliance testing involves evaluating a system against a set of pre-defined standards or checklists to ensure it meets regulatory and security requirements. In this case, the security expert is using a checklist to verify the system's compliance with relevant security standards.

Correct Answer: DLP testing

DLP (Data Loss Prevention) testing focuses on preventing sensitive data leakage. The other options do not specifically focus on sensitive data protection.

Correct Answer: Penetration testing

Penetration testing is a security testing practice that involves simulating attacks on a network or system in order to identify vulnerabilities that a real attacker could exploit. It is a proactive approach and is often conducted by a team of security experts who mimic the actions of potential intruders. This type of testing would be a priority for a team looking to identify vulnerabilities in a complex enterprise network, as it provides a realistic and comprehensive assessment of the network's defenses and risk exposures. Other answers such as 'Functionality testing', 'Conformance testing', and 'Regression testing' are types of software testing methods that serve different purposes. 'Functionality testing' ensures that all features of a system work as intended but isn't specifically focused on security. 'Conformance testing' is used to verify if an implementation complies with specified standards, it’s less about finding security flaws and more about ensuring standard compliance. 'Regression testing' is done after code changes to verify that the new code hasn't negatively affected existing system functionality, it checks for new bugs or regressions but doesn't focus on vulnerabilities that could be exploited by attackers. Therefore, these types of testing are not the primary types to use when identifying security vulnerabilities in a network.