What type of equipment is used for lifting and lowering loads at angles?

The correct choice involves the use of a rigging system with a pulley, which is specifically designed to lift and lower loads at various angles. A pulley system utilizes wheels to redirect the force applied, allowing for mechanical advantage and effective handling of loads that may not be directly vertical. This flexibility in moving loads at angles is a key function of pulley systems, making them ideal for tasks where direct vertical lifting isn't possible.

In contrast, the other options have limitations in this context. A standard hook, while useful for attaching loads, does not provide the necessary mechanical advantage or the capability to handle angles effectively. A chain block, which is generally used for lifting heavy loads vertically, also lacks the versatility for angled lifting. A fixed beam can help support loads but does not inherently offer the capability to adjust the angle at which a load can be lifted or lowered. So, the versatility and mechanical advantage of a rigging system with a pulley make it the best choice for manipulating loads at angles.