Which of the following is an example of using extrinsic evidence to impeach Wally the Witness?

Group of answer choices

A. Q to Wally:"Didn't you previously tell Abby that the robber was wearing a black shirt?"

B. Q to Wally:"Should we believe what you said to Abby, or what you are saying now?"

C. Q to Wally:"If I were to call Abby to the stand, would she confirm your story?"

D. Attorney calls Abby to the stand, and she testifies, "Wally told me the robber was wearing a black shirt."