Software reliability is described with respect to (A) Execution Time (B)…
2020
Software reliability is described with respect to
(A) Execution Time
(B) Calender Time
(C) Clock Time
Choose the correct answer from the options given below:
- A.
(A) and (B) Only
- B.
(B) and (C) Only
- C.
(A), (B) and (C)
- D.
(A) and (C) Only
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Correct answer: C
Answer: Execution Time, Calendar Time, and Clock Time are all used to describe software reliability.
Explanation:
Execution Time: the time during which the software is actually running; faults manifest only while executing, so reliability is often measured per unit of execution (for example, failures per execution‑hour).
Calendar Time: the wall‑clock elapsed time during which the system is in operation (including idle periods); this matters for availability and time‑dependent degradation or maintenance effects.
Clock Time: timing measurements tied to the system or CPU clock (high‑resolution or scheduler timing); important for timing‑sensitive failures and precise reliability measurements.
Therefore, all three time perspectives are relevant for describing software reliability.
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