What are the most significant supply chain challenges Apple is currently facing? What steps would you take to improve the efficiency and agility of Apple's supply chain? How would you describe Apple's recent approach to where suppliers are located and what do you think should guide the selection of future supplier locations? What do you think are the pros and cons of the "friend-shoring" concept? With reference to the Supply Chain Diamond, please comment on the strategic importance and current state of each of the four key areas of performance (i.e., customer service, supply chain costs, capital, and growth) as they apply to Apple's Supply Chain Transformation