Which of Following Statements Is/are True Concerning Strategy

Multiple Choice

Which of following statements is/are true concerning strategy?

A) Once a firm has chosen a strategy,it is unwise to change it,even though the company or business environment might change.
B) If a firm does decide to compete on more than one strategy,it must carefully execute both strategies to be successful.
C) Since the business environment is always changing,rather than stick constantly with one strategy,firms should pay close attention during times of change,and adjust their strategies accordingly.
D) Commodity type products are usually produced by differentiated firms.