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The command-line interface used to communicate with the Docker daemon is the Client CLI. This component acts as the primary interface for users to interact with Docker. Through the Client CLI, users can issue commands to create, manage, and interact with Docker containers, images, and other resources.

When executing commands, the Client CLI sends requests to the Docker daemon. The daemon is responsible for managing Docker containers, images, networks, and volumes, but it requires an interface like the Client CLI for users to input their commands. This allows for efficient management and orchestration of Docker environments.

The other components mentioned have distinct roles that do not function as a command-line interface. The Container Runtime refers to the component responsible for running containers, while Docker Hub is a cloud-based repository for sharing and storing Docker images. The Docker daemon itself handles the execution of Docker commands but does not provide the user interface for command input. Therefore, the Client CLI is specifically designed for this purpose, making it the correct answer.