Mr. George Bush is covered by a PBM plan that uses a closed formulary. This indicates that

A: he can receive coverage for pharmaceuticals only if they are on the PBM plan's preferred list of drugs B: he must receive all of his pharmaceuticals from a mail-order pharmacy program C: he can receive coverage for pharmaceuticals that are on the PBM plan's preferred list of drugs, as well as for pharmaceuticals that are not on the preferred list D: the PBM plan cannot receive a rebate on any pharmaceuticals it obtains from the pharmaceutical facture