Which of the Following Correctly Accounts for the Regulation of Carbamoyl

Which of the following correctly accounts for the regulation of carbamoyl phosphate synthetase I?

A) inhibited by N-acetylglutamate, activated by acetylation of a lysine residue
B) inhibited by N-acetylglutamate, activated by phosphorylation of a tyrosine residue
C) activated by N-acetylglutamate, inhibited by acetylation of a lysine residue
D) activated by N-acetylglutamate, activated by phosphorylation of a tyrosine residue
E) none of the above