What is the right thing to do

A pull the stopper and airlock, clean and replace
B nothing
C something else
There is a very little on the bottom of the drip tray

Hook up a blow off tube, until it slows down. There are two ways to do this. The first is if you only have small tubing- take apart the airlock (but be careful when you remove it, as liquid will come shooting out the top when you take off the airlock), and stick some tubing for your racking cane over the middle part of the airlock. Stick that back in the bung, and put the other end of the tubing under water in a pitcher. If you have bigger tubing that would fit, it's ideal to santize some tubing and jam one end of it in the carboy, and then stick the other other of the pitcher of water. I think it's 1" tubing that fits perfectly.

Agreed.

Sanitize some tubing, sanitize a two liter soda bottle and fill the soda bottle with water.

Stick tubing into airlock/bung and run the rest of the tubing into the water of the 2 liter bottle.

always have spare parts, that way you could sanitize and replace without it being left open
looking at the picture i would ask if the foam is receeding? if it is just swap in a clean airlock wipe down the outside a bit and let it roll :rockin: