A rapid intervention company/crew can perform:

A rapid intervention company or crew is specifically designated to provide immediate assistance to firefighters who may become trapped or incapacitated during emergency operations. Their primary function is to enhance the safety of the operational firefighters by being available to respond quickly to emergencies within the scene.

While their main priority is to remain ready to perform rapid intervention tasks, they can engage in other fire-ground duties as long as they do not compromise their ability to respond quickly to an incident involving lost or trapped firefighters. This balance is crucial because rapid intervention crews must maintain readiness, which generally means being in proximity to the emergency situation and prepared to act without delay.

In this context, the emphasis is on being "readily available" for rapid intervention while still contributing to the overall operations on the fire ground. Other choices suggest limitations on their capabilities that would not align with their flexible role in supporting overall firefighting efforts while prioritizing rapid response.