What is meant by "tightening security" at the gangway?

The phrase "tightening security" at the gangway refers specifically to enhancing procedures that prevent unauthorized access to a secured area, such as a ship. This involves implementing additional measures that can include enforcing stricter access controls, employing identification checks, or utilizing security personnel. The objective is to ensure that only authorized individuals can enter or exit through the gangway, thereby enhancing the safety and integrity of the vessel.

While increasing the number of crew members at the gangway and limiting access to only essential personnel can contribute to overall security, these actions are often considered part of broader security measures rather than the essence of "tightening" security. On the other hand, decreasing the number of inspections would contradict the objective of tightening security, as it would mean reducing vigilance rather than enhancing it. Thus, the correct answer focuses on the fundamental action of enhancing security protocols to better control access.