Securing container environments from newly emerged security threats involves employing specific security mechanisms tailored to the technology and structure of containers. In this context, the use of Docker-related application control signatures (Option D) is critical for effectively managing and mitigating threats in containerized environments.

Docker-Specific Threats: Docker containers, being a prevalent form of container technology, are targeted by various security threats, including those that exploit vulnerabilities specific to the Docker environment and runtime. Using Docker-related application control signatures means implementing security measures that are specifically designed to detect and respond to anomalies and threats that are unique to Docker containers.

Application Control Signatures: These are sets of definitions that help identify and block potentially malicious activities within application traffic. By focusing on Docker-related signatures, administrators can ensure that the security tools are finely tuned to the operational specifics of Docker containers, thereby providing a robust defense against exploits that target container-specific vulnerabilities.

References: The recommendation to use Docker-related application control signatures is based on best practices for securing container environments, emphasizing the need for specialized security measures that address the unique challenges posed by container technologies.