An Advantage of Buying Component Parts, or Even an Entire

An advantage of buying component parts, or even an entire product, from independent suppliers is that:

A) it can make planning, coordination, and scheduling of adjacent processes easier for the firm.
B) the firm can maintain its flexibility by switching orders according to circumstances.
C) the firm will be able to maintain strict control over its proprietary technology.
D) the firm will have access to superior quality raw materials and will deliver high quality products.