sin 90 degrees, cos 0 degrees, tan 45 degrees, csc 90 degrees, sec 0 degrees, cot 45 degrees,
A. 1, 1, 1, 1, 1, 1
B. 0, 1, 1, 1, 1, 1
C. 1, 0, 1, [infinity], 1, 1
D. 1, 1, √2, 1, [infinity], 1