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Assertion (A): A predicted match should still be verified visually before approval.
Reason (R): The calculation models a standard observer rather than the customer concerned.

  • 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

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. The prediction is an integration over standard observer functions, and no real person has exactly those functions - nor does the calculation know the surround, the geometry or the sample’s texture. A visual check under the agreed lighting catches what the numbers do not.

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