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The correct answer is the Daemon, which is a crucial component of Docker that manages the building, running, and delivering of containers. The Docker Daemon, also known as `dockerd`, operates as a server that handles container lifecycle processes. This includes building images from Dockerfiles, managing containers' runtime, and facilitating communication between the client and the server.

The Daemon listens for API requests and handles the management of Docker containers, images, networks, and volumes, allowing users to create and control containers in a seamless manner. Its operations are integral to the container orchestration and management tasks scaling from local development environments to large-scale production environments.

The other components, while important in their own rights, serve different purposes. The Image is a portable, lightweight, standalone, executable software package that contains everything needed to run a piece of software, including the code, runtime, libraries, and environment variables. The Hub usually refers to Docker Hub, which is a cloud-based repository for sharing Docker images, where users can store and share their images with others. The Client refers to the command-line interface or graphical interface that users interact with to send commands to the Docker Daemon, but it doesn't directly handle the building, running, or delivering of containers.