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Assertion (A): Return period is a misleading way to express design risk.
Reason (R): Encounter probability over the design life is far higher than the annual figure.

  • A.A is false but R is true
  • B.Both A and R are true, and R is the correct explanation of A
  • C.Both A and R are true, but R is not the correct explanation of A
  • D.A is true but R is false

Answer: B

Both are true and the reason gives the reason, and a hundred year event is likely within fifty years. Modern guidance expresses the target as an encounter probability directly. The change makes the residual risk explicit to the client.

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