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