Answer: Option D
Answer: (d)
implement (Verb) : to make something that has been officially decided to start, to happen or be used; carry out
revoke (Verb) : to officially cancel something so that it is no longer valid; invalidate
negate (V.) : to stop something from having any effect ; nullify
annul (V.) : to state officially that something is no longer legally valid
invalidate (V.) : to prove that an idea, a story, an argument, etc. is wrong