It Was Discovered That a Patient Who Was to Receive

It was discovered that a patient who was to receive two units of packed RBCs had an anti-Le^a circulating in his system. What would be the proper procedure?

A) Anti- Le^a is clinically insignificant, and two units could be issued without further workup.
B) Multiple units should be screened for Le^a antigen, and only two of the units negative for that antigen should be transfused.
C) The two units do not necessarily need to be Le^a-negative but should be crossmatched through at least 37 degrees and crossmatch compatible before given
D) The transfusion should be halted until specially screened units are flown in