Explain different benefits of full disk encryption

Question
One billion dollar company isn’t taking chances with data stored on its laptops. It deployed full disk encryption on every machine, an increasingly popular security strategy.The laptop storing the company’s trade secrets or the laptop containing proprietary partner and customer data, and the company’s financial information. The Company can afford neither to be not left behind in a cab or hotel room, nor be stolen by a determined thief working for a competitor, or one looking to sell hardware on eBay.
Task

List two latest full disk encryption methods with appropriate examples.
Explain different benefits of full disk encryption or known shortcoming with the technology.
Explain the associated cost for full rollout of full disk encryption on every laptop (assume 25 k employees).
Suggest whether this approach is either unnecessary/unrealistic or good.
Explain Symantec endpoint encryption for windows.

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