Which of the following does not hold true of revocation of acceptance by the buyer?

Select one:

a. He/she can revoke acceptance when the nonconformity substantially impairs the value of the goods

b. He/she can revoke acceptance even after accepting goods with the knowledge of the nonconformity

c. He/she must revoke the goods within reasonable time after the buyer discovers the nonconformity

d. He/she after revoking acceptance would have the same rights and duties with regard to goods involved as they had rejected them