In the figure shown, which pair of angles must be complementary?
∠AOC and ∠DOB
∠AOC and∠COD
∠COD and ∠DOB
∠COB and∠AOC
4 rays sharing point O. Ray A O, ray C O, ray D O, and ray B O in that order from left to right. Angle C O B is a right angle. ray D O is between ray C O and B O. Ray A O is on the left of ray C O and is acute.
