You need to design a method to encrypt confidential data. Your solution must address the concerns of the chief information officer. What should you do？（）
A. Encrypt customer information when it is stored and when it is being transmitted
B. Require encrypted connections to the public Web site， which is hosted on the Web server on the perimeter network
C. Encrypt all marketing information on file servers and client computers
D. Require encrypted connections to all file server
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