please answer the question within 30 minutes in very detailed manner. make sure the answer and reasons are explained in very detailed manner as in why the option is correct and why other options are incorrect else i will give negative ratings for sure.

1. Which of the following is NOT an advantage of vertical integration? O a) Integration improves strategic focus, giving the organization a competitive advantage O b) All of the alternatives are advantages O c) Companies can obtain more predictable deliveries by reducing dependence on external parties O d) Lead times can be reduced by better coordination of actions taken across different stages O e) Supply disruptions happen less frequently due to improved control and visibility 2. Car maker Tesla has chosen to manufacture their car batteries themselves by building their own $5 billion Gigafactory in Nevada. There are other companies that have been developing and manufacturing batteries much longer such as LG, Panasonic, and Samsung. What is Tesla's primary reason for building batteries themselves rather than out-sourcing to one of these well-established battery producers? a) To improve communication with their raw material suppliers O b) To reduce lead time in their retail store supply chain O c) To control this strategic process as it is critical for the company's success O d) To improve the quality of their batteries