The following statements concerning the parotid salivary gland are true except
A.
The facial nerve passes through it dividing the gland into superficial and deep parts.
B.
The secretomotor nerve supply is derived from the facial nerve.
C.
The parotid duct pierces the buccinator muscle and opens into the mouth opposite the upper second molar tooth.
D.
The external carotid artery divides within its substance to form the superficial temporal and maxillary arteries.
E.
The retromandibular vein is formed within it by the union of the superficial temporal vein and the maxillary vein.