Which of the following is the BEST method to prevent malware from being introduced into a production environment?

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Which of the following is the BEST method to prevent malware from being introduced into a production environment?
A . Purchase software from a limited list of retailers
B . Verify the hash key or certificate key of all updates
C . Do not permit programs, patches, or updates from the Internet
D . Test all new software in a segregated environment

Answer: D