Which Autonomic Receptor Is Blocked by Hexamethonium at the Ganglia $\alpha$

Which autonomic receptor is blocked by hexamethonium at the ganglia, but not at the neuromuscular junction?

A) Adrenergic $\alpha$ receptors
B) Adrenergic $\beta_{1}$ receptors
C) Adrenergic $\beta_{2}$ receptors
D) Cholinergic muscarinic receptors
E) Cholinergic nicotinic receptors