From the definition of reliability, it follows that in any reliability program there must be: (a) A qualification of reliability in terms of probability (b) A statement defining successful prototype performance (e) Avoidance of harsh environments in which the equipment must operate (d) A statement of the required warranty coverage

Option a

Explanation:

Reliability can be defined as the probability of the performance of any article or item.

Reliability of a system tends to ensure that an item is capable of performing a specified function that it is required to perform without any failures.

The system must perform its required task for a stipulated period of time under a given condition without failing.