what white house official provided additional testimony against nixon, including tape recordings?\no…

what white house official provided additional testimony against nixon, including tape recordings?\no alexander butterfield\no archibald cox\no john dean\no carl bernstein
Answer
Brief Explanations:
Alexander Butterfield was a White - House official who revealed the existence of the Nixon White House taping system, providing crucial evidence against Nixon. Archibald Cox was a special prosecutor. John Dean gave testimony but not related to tape - recordings in the same way as Butterfield. Carl Bernstein was a journalist.
Answer:
A. Alexander Butterfield