Which of the Following Statements Best Defines Manufacturing Cells

Which of the following statements best defines manufacturing cells?

A) They are manufacturing areas that use a "push-through" approach whereby finished goods are manufactured on the basis of demand forecasts.
B) They are manufacturing centers which focuses on production of a single product and in which workers focus on master one skill so as to be efficient and effective in their work
C) They are work areas with different types of equipment grouped together to make related products and to minimize handling costs
D) They are production centers positioned in various areas throughout a production facility, close to the associated talent (direct laborers) in which goods are manufactured only after receiving customer orders.