After coupling a converter dolly to a trailer, how do you confirm the pintle hook is properly latched?

Correct answer to question 34 (Doubles/Triples): Check that the locking mechanism is closed and the safety latch is engaged over it

Why

A pintle hook coupling is only secure once its locking mechanism is closed and the safety latch is engaged over it, and that has to be checked directly rather than assumed from other signs.