Which type of ship is primarily designed for anti-submarine warfare?

The correct answer is frigate. Frigates are specialized naval vessels specifically designed to conduct anti-submarine warfare (ASW) operations. They typically feature a range of advanced sonar systems, torpedoes, and other ASW equipment that allows them to detect and engage submarines effectively. Their smaller size and agility compared to larger ships like destroyers or aircraft carriers make them well-suited for patrolling and responding to submarine threats.

In addition to their ASW capabilities, frigates often play multi-role functions, which can include surface warfare and air defense, but their primary mission profile focuses heavily on protecting against submarine threats. This is a critical role in modern navies, where submarines can pose significant risks to surface fleets and coastal installations.

Aircraft carriers are more focused on projecting air power and supporting fixed-wing and rotary-wing aircraft operations, while destroyers primarily serve roles in surface warfare and air defense. Lighthouse tenders, on the other hand, are not combat vessels at all; they are tasked with maintaining navigational aids and do not engage in warfare. Thus, the design and mission of frigates align directly with the objective of anti-submarine warfare, making them the most appropriate choice in this context.