According to Raymond E. Miles and Charles C. Snow in their book Organizational Strategy, Structure and Process, businesses engage in strategy implementation on a longer-term basis in one of four ways. Historically, Berkshire Hathaway's business model has been one of buying insurance companies such as Geico. But recently, Berkshire Hathaway has been moving away from buying insurance companies with great "floats" and instead buying major industrial-type businesses. Based on this, how would Miles and Snow characterize the firm of Berkshire Hathaway?

a. Defender

b. Reactor

c. Prospector