Which team member is required to hold a TWIC and undergo specific security training?

The correct choice identifies that Vessel Personnel with Designated Security Duties are required to hold a Transportation Worker Identification Credential (TWIC) and undergo specific security training. This designation includes personnel who are responsible for the implementation and maintenance of the vessel security plan, ensuring that all security measures are enforced onboard.

Holding a TWIC is critical for these individuals because it ensures that they have undergone the necessary background checks and are authorized to access secure areas of the vessel and the port. Additionally, specific security training equips them with the knowledge and skills to identify and respond to security threats effectively. This is essential for maintaining compliance with maritime security regulations and the safety of the vessel and its personnel.

While the other options may involve individuals who play vital roles in security protocols aboard vessels, only those with designated security duties are explicitly required to obtain a TWIC and receive this tailored security training as per regulations established under the Maritime Transportation Security Act.