During the course of the Watergate investigation, what did investigators learn about the White House? The White House had destroyed its video surveillance system. All the president's conversations and phone calls were recorded. Only the president knew of the recorded calls at the White House. It was impossible to install a voice recording system inside the Oval Office.

Option: All the president's conversations and phone calls were recorded.

Explanation:

The Watergate Scandal caused a disturbance in Americans. Breaking in the Watergate complex and subsequently conceal evidence by President Nixon led the FBI to investigate the situation.

During the investigation, the FBI found the Nixon tapes which were part of the covert recordings of his conversations and phone calls in the Oval Office. It revealed that the president had been part of an unlawful act as he was covering up from the beginning.

the answer would be c