All of the Following Are Examples of Posttranslational Modifications,EXCEPT_________

All of the following are examples of posttranslational modifications,EXCEPT_________ .

A) The N- terminal amino acid is often removed or modified.
B) Polypeptide chains can be cleaved to produce a shorter and functional polypeptide.
C) Individual amino acid residues are sometimes modified,such as adding a phosphates,acetyl,or methyl groups can be added.
D) Polypeptides can be degraded and then reassembled to produce entirely different sequenced polypeptides.
E) Prosthetic groups,such as metals or vitamins,can be added.