For each distinct operation that takes place in a time-driven operation, a ______ must be assigned.

• A. Timer
• B. Step
• C. Phase
• D. Event

Answer: (A)

In time-driven control, each distinct operation needs a way to enforce and track how long it should last. A timer provides that mechanism: it starts at the beginning of the operation, counts the allocated duration, and signals when time is up so the system can move to the next step. This ensures every operation runs for the exact intended interval and the overall sequence stays synchronized.

Other terms describe parts of the process or when something happens, but they don’t inherently control or measure duration for each operation. They help structure or trigger things, but the timer is what actually governs the timing of every distinct operation.