A dipeptide has the sequence H2N–CH2–CO–NH–CH(CH2OH)–CO–OCH3. Assume that conformational flexibility allows every potential hydrogen-bond donor to pair with any available acceptor within the same molecule, and that each donor and acceptor can participate in only one hydrogen bond. Under these idealized conditions, what is the maximum number of intramolecular hydrogen bonds this single dipeptide molecule could form at one time?
a) 3
b) 1
c) 4
d) 2