Discussion
Assertion (A): Three units are fitted where the attitude function is critical.
Reason (R): Two units can detect a disagreement but cannot say which is wrong.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the assertion. With two units a comparator can establish that the outputs disagree, but nothing in the data identifies the culprit, so both must be treated as unreliable and the critical function is lost.
A third unit resolves the ambiguity: the failed unit is the one that disagrees with both of the others, and median voting excludes it while operation continues on the two that agree. Three is therefore the fewest that gives fail-operational behaviour, which is why it is the usual minimum where attitude is critical.
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