Let a, b, c, and d be real numbers such that a > b and c > d. Which of the below statements are true?
(A) a + c > b + d.
(B) 2a + 3c > 2b + 3d.
(C) a/b > b/d.
(D) a*b > c*d.
(E) 1/a + 1/b > 1/c + 1/d,
(F) a^b > c^d.
