Aggregate Planning Differs from Scheduling in That

Aggregate planning differs from scheduling in that

A) the former refers to the long range and the latter refers to the short range.
B) the former is concerned with allocating available resources and the latter with the acquisition of resources.
C) the former refers to the long range and the latter refers to the medium range.
D) the former is concerned with the acquisition of resources and the latter with allocating available resources.