What size, spacing, grade, and type of joists are commonly used over the garage?

A) 2x6 #2 Southern Pine joists spaced 12 inches on center
B) 2x8 #1 Douglas Fir-Larch joists spaced 16 inches on center
C) 2x10 #2 Spruce-Pine-Fir joists spaced 24 inches on center
D) 2x12 #1 Hem-Fir joists spaced 18 inches on center