What Is Dicyclohexylcarbodiimide (DCC)used for in Peptide Synthesis

What is dicyclohexylcarbodiimide (DCC) used for in peptide synthesis?

A) DCC protects the amino group of the intended N-terminal amino acid.
B) DCC activates the carboxyl group toward nucleophillic attack.
C) DCC cleaves the blocking groups from the final peptide.
D) DCC is the resin (solid support) used to anchor the growing polypeptide.
E) DCC removes the peptide from the resin at the conclusion of the synthesis.