Final answer:
Fault Tolerance in cloud computing ensures continuous operation of services and applications despite component failures, corresponding to answer option a.
Step-by-step explanation:
Fault Tolerance in the context of cloud computing refers to the ability of a system or service to continue operating without interruption when one or more of its components fail. With proper fault tolerance mechanisms in place, cloud services and applications remain available to users even in the event of hardware malfunctions, software crashes, or other unforeseen issues. Therefore, the correct answer to the question is option a: 'Ensure services and applications remain available in the event of a failure.'