A reliable system will be one that
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Is unlikely to be completed on schedule
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Is likely to be fault-free
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Is unlikely to cause a failure
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Is likely to be liked by the users
Reliability is the probability that a system performs its intended functions without failure under stated conditions for a specified period. It measures operational consistency and uptime. Option B describes an impossible ideal (fault-free); option A is about schedule not reliability; option D describes usability not reliability.
To answer this question, we need to understand the concept of reliability in the context of systems.
Option A) Is unlikely to be completed on schedule - This option is incorrect. The completion schedule of a system does not necessarily determine its reliability. A system can be completed on schedule but still be unreliable.
Option B) Is likely to be fault-free - This option is incorrect. While a fault-free system is desirable, it does not guarantee reliability. Reliability refers to the ability of a system to perform its intended functions without failure, regardless of the presence of faults.
Option C) Is unlikely to cause a failure - This option is correct. Reliability is often measured by the ability of a system to avoid failures. A reliable system is one that is unlikely to cause a failure and can consistently perform its intended functions.
Option D) Is likely to be liked by the users - This option is incorrect. User preference or likability does not necessarily determine the reliability of a system.
The correct answer is Option C) Is unlikely to cause a failure. This option is correct because a reliable system is one that can consistently perform its intended functions and avoid failures.