Final answer:
To perform a resistance test on a relay coil, you need to set your DMM to the red (a) setting.
Step-by-step explanation:
To perform a resistance test on a relay coil, you need to set your DMM to the red (a) setting. The color coding of the DMM settings indicates the range of resistance that can be measured. Typically, the red setting represents the lowest resistance range, which is suitable for testing a relay coil.