Originally Posted by Demise

There's a bit more to that. As per ID44 form you need to show the EAD and evidence of "valid U.S. lawful status as defined by 6 C.F.R. 37.3". 6 C.F.R. 37.3 lists "deferred action" as a lawful status for purposes of the REAL ID Act, what would be the evidence of that? The I-821D approval notice.

So bring them the following:
EAD
I-821D Approval Letter
Social Security Card
Two proofs of residence

I also recommend bringing a printout of ID44 form and printout of 6 C.F.R. 37.3 which states that deferred action counts, just in case you have to argue with them you can pull out the sheets of paper and say this is what the law says.