Which Is True Concerning the Internal and External Urethral Sphincters

Multiple Choice

Which is true concerning the internal and external urethral sphincters?

A) The internal sphincter is involuntary smooth muscle and the external is voluntary striated muscle.
B) The internal sphincter is voluntary striated muscle and the external is involuntary smooth muscle.
C) Both are involuntary smooth muscle.
D) Both are voluntary striated muscle.