What are the three main duties at checkpoint operations?

The correct choice highlights the specific roles assigned to agents during checkpoint operations, which are categorized into three distinct functions. Primary agents are responsible for the initial inspection and interaction with travelers. They assess the situation, conduct interviews, and perform preliminary checks. Secondary agents typically take on the role of additional support, providing a more in-depth examination if required. Backup or Rover Agents serve as support for both primary and secondary operations, stepping in to assist with various tasks as needed.

These roles are specifically tailored to ensure a smooth and efficient operation at checkpoints, maximizing safety and effectiveness in border security. The focus on these operational categories allows law enforcement to respond dynamically to the different needs that may arise during checkpoint activities. This structured approach helps ensure that the duties are carried out effectively, addressing issues of safety, compliance, and enforcement.

In contrast, the other options either describe actions (like search and seize) that might occur as part of the larger operational goals but do not capture the organized framework of responsibilities that agents have during checkpoint operations.