Researchers in the Johnson group at MIT are exploring ways to safely deliver drugs into the human body. One method they developed involves attaching the drug onto a polymer framework to make a macromolecular prodrug. One step in the synthesis involves forming an ester from a carboxylic acid and a phenol. By name or number, identify all of the following three reagents that could accomplish this transformation: 1) aqueous hydrogen chloride 2) dicyclohexylcarbodiimide 3) sodium hydroxide solution