Which two practices are recommended for an acceptable security posture in a network? (Choose two.)

Which two practices are recommended for an acceptable security posture in a network? (Choose two.)

A. Use a cryptographic keychain to authenticate to network devices. B. Place internal email and file servers in a designated DMZ. C. Back up device configurations to encrypted USB drives for secure retrieval. D. Disable unused or unnecessary ports, interfaces, and services. E. Maintain network equipment in a secure location.