which CDG terminal to book car out of?

I'm looking to rent a car out of CDG airport.

The only problem I'm having is which terminal to rent out of?

When booking online, Europcar asks me the terminal and I have no idea (i've never traveled there either to be able to make a somewhat educated guess).

We are flying on AirFrance from the US to Paris.

It appears it may be terminal 2, but it then asks me WHICH terminal 2D or 2F?

Does it really make a big difference?

 The airport site was really no help, except to tell me terminal 2 was for international AirFrance flights.

thanks!

Denise