Which one of the following statements about the just$-$in$-$time $($JIT$)$ system is not correct?

a$.$ The JIT system is a refinement of the materialrequirements$-$planning system.

b$.$ The application of the JIT system will imply that larger quantities will be ordered less often.

c$.$ The JIT philosophy e ideavours to manufacture products without inc' rring significant inventory costs.

d$.$ JIT is based on the premise that actual orders for finished products are converted into orders for raw material and components.

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