Answer (A) is correct.
The objective of JIT is to reduce carrying costs by eliminating
inventories and increasing the deliveries made by suppliers. Ideally,
shipments of raw materials are received just in time to be incorporated
into the manufacturing process. The focus of quality control under JIT is
the prevention of quality problems. Quality control is shifted to the
supplier. JIT companies typically do not inspect incoming goods; the
assumption is that receipts are of perfect quality. Suppliers are limited to
those who guarantee perfect quality and prompt delivery.