The mechanism of action of the exotoxin produced by Corynebacterium diphtheriae can be characterized by which of the following?
Acting as a superantigen that binds to MHC class II protein and the T-cell receptor Blocking the release of acetylcholine causing anticholinergic symptoms Blocking the release of glycine Inhibits protein synthesis EF-2 adenosine diphosphate (ADP) ribosylation.