Discussion
Assertion (A): A single parity bit is adequate protection for critical data.
Reason (R): Parity detects any odd number of bit errors in the word.
Select the correct answer from the options below.
Answer: D
Correct answer: A is false but R is true
The reason is correct as far as it goes: parity does detect any odd number of bit errors. But it refutes the assertion rather than supporting it, because the complement is that it detects no even number at all.
Two corrupted bits pass undetected, and noise bursts commonly corrupt several adjacent bits at once. Parity is adequate on ARINC 429 only because a discarded word is replaced within milliseconds; data not repeated at that rate needs a CRC, which is why later standards use one.
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