Which one of the following statements concerning production and staffing plans is FALSE?

a. A producer of greeting cards for all occasions can use a level strategy to good advantage because of the complementary nature of the products and the workforce to produce many varieties of cards.

b. A production plan generally focuses on production rates and inventory holdings, whereas a staffing plan focuses on staffing and other labor-related factors.

c. A master production schedule is a schedule that specifies the timing, size, and sequence of production for aggregated product families.

d. Aggregation can be performed along three dimensions: product families, labor, and time.