The type of timer program shown is a:

A) retentive on-delay.
B) retentive off-delay.
C) nonretentive off-delay
D) nonretentive on-delay.

The timer program shown is a retentive on-delay timer. This is because it has a memory function that allows it to retain its timing value while the input signal is on, and only begins counting down once the input signal turns off.