An infant presents to the emergency department due to difficulty breathing, constipation, and anorexia. Upon examination, the physician notes flaccid paralysis. A toxin screen of the stool identified the agent. What is the mechanism of action of the toxin?

  •  ADP ribosylation of GTP-binding protein
  •  Blocks release of acetylcholine
  •   ADP ribosylation of eukaryotic elongation factor 2 (eEF-2)
  •  Blocks release of inhibitory transmitters GABA and glycine
  •  ADP ribosylation of Gi