✅ Correct Answer: D. Time policy
A Time Policy defines:
- Start event (e.g., purchase date)
- Duration (e.g., 12 months, 1 year)
- End behavior (e.g., end of commitment, pro-rated periods, etc.)
It is used to determine when charges begin and end for subscriptions and recurring pricing elements.

❌ Why the Other Options Are Incorrect:
A. Pricing element: Defines the amount and type of price (e.g., recurring, one-time), not the duration or timing.
B. Time plan: ❌ Specifies the duration pattern (e.g., monthly, annually) but doesn’t manage start/end logic tied to events.
C. Pricing variable: ❌ Used to feed attribute values into pricing logic, not to manage subscription timing.