What does a security sweep involve?

A security sweep primarily involves conducting a walkthrough inspection of unrestricted spaces to identify any unauthorized access or potential vulnerabilities. This process is crucial for maintaining the security of a vessel and ensuring that all areas are secure and that no suspicious activities are taking place. During the sweep, security personnel are trained to observe and assess the current security status of various locations onboard.

In contrast, while the other options may pertain to aspects of vessel security, they do not encapsulate the specific action of a security sweep. Performing a detailed security system check is related to the integrity of electronic or mechanical systems. Reviewing security protocols and documents involves an evaluation of policies rather than a physical inspection. Similarly, conducting a series of interviews with the crew addresses human factors and communication but does not directly involve the physical assessment of spaces. Thus, the essence of a security sweep lies in the thorough physical inspection characteristic of option B.