Patriot Master Gunner (PMG) Module C Practice Test

In auto IFF, the system automatically sends identification queries to targets to determine friend or foe, but this automatic interrogation can be limited by a boundary on the track display known as the multipurpose line. When that boundary is set to IFPID, targets beyond the IFPID boundary are not automatically interrogated. That makes IFPID the setting that directly controls whether automated IFF interrogations extend past a certain point, which matches the statement in the question. The other options relate to different functions (turning IFF on or off, enabling a PID function, or a separate feature entirely) and do not define this automatic interrogation boundary.