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Tim Cook, chief executive officer of Apple Inc., speaks during the Apple Inc. Spring Forward event in San Francisco, California, U.S., on Monday, March 9, 2015. Cook returns to the spotlight to answer questions on many of the Apple Watch's key selling points, including price range, battery life and when in April it will reach stores. Photographer: David Paul Morris/Bloomberg via Getty Images

Tim Cook, chief executive officer of Apple Inc., speaks during the Apple Inc. Spring Forward event in San Francisco, California, U.S., on Monday, March 9, 2015. Cook returns to the spotlight to answer questions on many of the Apple Watch's key selling points, including price range, battery life and when in April it will reach stores. Photographer: David Paul Morris/Bloomberg via Getty Images