Which of the following components is responsible for handling and securing cargo within a container?

The component that is responsible for handling and securing cargo within a container is the corner fittings. Corner fittings are essential parts located at each corner of the container, designed to provide structural integrity and facilitate the attachment of securing devices. They also serve as connection points for handling equipment like cranes and forklifts, allowing for safe loading, unloading, and securing of cargo.

Corner fittings are critical because they ensure that the container can be safely stacked and transported without compromising the integrity of the cargo inside. In addition to providing secure attachment points, corner fittings help in distributing the weight of the cargo evenly, which prevents shifting during transport.

The other components listed, such as bottom end rails, end frames, and top side rails, contribute to the structure and stability of the container as a whole but do not primarily serve the function of securing the cargo. Their roles are more about providing overall integrity and shape to the container rather than being directly involved in cargo handling and securing.