Which of these is the correct interpretation of the ordered pair (0,1) on the unit circle?

A. The sine of π/2 radians is 1 and the cosine of π/2 radians is 0.
B. The sine of π/2 radians is 0 and the cosine of π/2 radians is 1.
C. The sine of π radians is 1 and the cosine of 3π/2 radians is 0.
D. The sine of π radians is 0 and the cosine of 3π/2 radians is 1.