Why is it important to have logical security controls on endpoints even though the users are trained to spot security threats and the network devices already help prevent them?

Why is it important to have logical security controls on endpoints even though the users are trained to spot security threats and the network devices already help prevent them?
A. because defense-in-depth stops at the network
B. because human error or insider threats will still exist
C. to prevent theft of the endpoints
D. to expose the endpoint to more threats

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