While Presidents for Many Years Have Held Press Conferences and Answered

While presidents for many years have held press conferences and answered reporters' questions, it was President Eisenhower who changed the format. How did Eisenhower hold his press conferences?

A) Eisenhower invited reporters to the White House for the first time.
B) Eisenhower allowed a press pool that included any reporter of a major newspaper who wished to attend.
C) Eisenhower was the first president to use the radio as a medium to reach Americans.
D) Eisenhower was the first to hold regular news conferences as a means of explaining his administration's policies.
E) Eisenhower was televised, but the questioning was very rigid and the answers had to be preapproved.