Identify the linear pair of angles from the given options.

A linear pair is two adjacent angles that add up to 180 degrees and form a line. You can have two supplementary angles that are not adjacent, so they are not linear pairs; instead, they are supplementary.

If the non-common arms of two adjacent angles are two opposite rays, they form a linear pair of angles. There are two linear pairs in the figure: $\angle AOC$ and $\angle COB$ and $\angle AOD$ and $\angle DOB$