In Terms of Strategy Making, What Is the Difference Between

In terms of strategy making, what is the difference between a one-business company and a diversified company?

A) The first uses a business-level strategy, while the second uses a set of business strategies and a corporate strategy.
B) The first uses a business-level strategy, while the second uses a corporate-wide strategy.
C) The first uses an operating strategy, while the second uses a business-line strategy.
D) The first uses a functional strategy, while the second uses a business-line strategy.
E) The first uses a single-line strategy, while the second uses a multi-line strategy.