A programmed latching relay instruction is retentive. If the relay is latched and power is lost and then restored, the relay will:

• A. Unlatch
• B. Remain latched
• C. Reset to off
• D. Toggle to the opposite state

Answer: (B)

The key idea is that a programmed latching relay instruction is retentive, so it holds its last state even when power is removed. If the relay is latched and power is lost, the magnetic/mechanical latch keeps the contacts in the latched position. When power is restored, nothing forces an unlatch unless a reset or unlatch command is issued. So it stays latched.

It wouldn’t unlatch just from power loss, nor reset to off, nor automatically toggle to the opposite state because those actions require an explicit reset or a deliberate opposite pulse.