A 62-year-old man is brought to the ED after sudden onset hoarseness and difficulty swallowing. He also reports reduced gag reflex and has episodes of bradycardia noted on telemetry. Neurologic exam suggests involvement of a cranial nerve that emerges from the ventrolateral medulla in the postolivary sulcus, just caudal to another nerve involved in taste and swallowing. On a ventral view of the brainstem, which cranial nerve is most consistent with this finding?