A history quiz had three questions on presidents of the United States. Here are the answers of six students: Amelia, Barry, Carol, Danny, Eileen and Frank.

Amelia: Eisenhower, Eisenhower, Kennedy.
Barry: Kennedy, Kennedy, Eisenhower.
Carol: Truman, Truman, Eisenhower.
Danny: Kennedy, Eisenhower, Truman.
Eileen: Truman, Kennedy, Kennedy.
Frank: Kennedy, Truman, Truman.

Every student answered at least one question correctly. What are the correct answers?