Verify that f(a) = 2; 11, f(b) = 2; 6, f(c) = 2; 2, and that f(d) = 1.

A) 2, 11; 2, 6; 2, 2; 1
B) 2, 11; 2, 6; 2, 2; 1
C) 2, 11; 2, 6; 2, 2; 1
D) 2, 11; 2, 6; 2, 2; 1