Glutamine phosphoribosyl pyrophosphate amidotransferase catalyzes step 2 in the biosynthesis of purines.Which of the following regarding the regulation of this enzyme is correct?

A)It is accelerated by an input of ATP or GTP.
B)It is sensitive to activation by azaserine.
C)It is accelerated by an input of AMP or GMP.
D)The G series of nucleotides as well as the adenine nucleotides act as competitive inhibitors.