Wanting to drive to the beach today. Checking all fluids and want to make sure the trans is topped off. Which one of these plugs is the fill/check plug? Any help would be greatly appreciated...

 

The answer is C. Just to be sure you know: Do not remove the plug unless the engine is running. The fluid temp. should be 30-50 deg. C. I measure it by sticking a indoor/outdoor thermometer sensor in the fill hole, and close it up if fluid dribbles out at 30- 35 deg.