________ delivers the precise number of parts to be assembled into a finished product at precisely the right time.

A) JIT
B) The bullwhip effect
C) Vertical integration
D) VMI

JIT, or Just-In-Time, is a management strategy that aligns raw-material orders from suppliers directly with production schedules. It aims to increase efficiency and decrease waste by receiving goods only as they are needed in the production process, thereby reducing inventory costs. This approach ensures that the precise number of parts required for assembly is delivered exactly when needed.