Container image hardening best practices include removing default or unnecessary applications (A) to reduce the attack surface and disabling insecure protocols like Telnet (C) to prevent exploitation.
Minimizing software components reduces vulnerabilities and limits potential exploits.
Installing a Network Intrusion Prevention System (NIPS) (B) is a network security measure, not typically embedded in a container image. Reconfiguring DNS (D), adding an SFTP server (E), or deleting public certificates (F) are unrelated or could disrupt container functionality.
These practices are part of securing containerized environments covered under Security Architecture topics in SY0-701#6:Chapter 10 CompTIA Security+ Study Guide#.