The breaker box for a second floor apartment is in the basement. I would like to move the breaker box into the apartment using a double pole feeder breaker. All the breakers in the basement will be removed except for the new feeder breaker. The new 100 amp sub panel is 30 feet away. What kind and size of wire and feeder breaker do I use?

Remote panel will need 4 wires since it is a sub panel. Feed breaker depends upon wire size. #2 AL four wire will work.