The electromagnetic latching relay:

A) is used to lock in a condition.
B) uses a latch coil to set and hold the relay in the latched position.
C) uses an unlatch coil to disengage the mechanical latch.
D) all of these.

Electromagnetic Latching Relay

A type of relay that maintains its state after being actuated, using a permanent magnet to hold the armature in position until it is reset.

Latch Coil

A coil in a relay or electrical circuit that, once energized, maintains its state until it is specifically reset, allowing it to function as a memory element in a control system.

Unlatch Coil

An instruction or action that interrupts the current flow to a coil, allowing a relay or similar device to return to its de-energized state.