Show of Hands

Noone, cats aren't pack animals with a leader like dogs.
The cat is opportunistic here because it's fed and cared for, like most pets.

I am pretty sure every cat knows the answer and it's not what you would like to think...

The cat is the master. We should learn to embrace this. :) :P

Can opener.

I expect the cat doesn't even regard it that way, but more as a symbiotic relationship. They'll let you feed and house them, and in return they'll provide trip-you-while-you're-walkings and buttholes-to-faces.

Depends on the cat.