What size rafters, ceiling joists, and spacing does the roof extension over the garage commonly use?

A) 2x6 rafters, 2x4 ceiling joists, spaced 16 inches on center
B) 2x8 rafters, 2x6 ceiling joists, spaced 24 inches on center
C) 2x10 rafters, 2x8 ceiling joists, spaced 12 inches on center
D) 2x12 rafters, 2x10 ceiling joists, spaced 18 inches on center