The internal anal sphincter is involuntary and innervated by the ______, while the external anal sphincter is voluntary and innervated by the ______.
sacral splanchnics; pelvic splanchnics
pelvic splanchnics; inferior rectal nerves
pelvic splanchnics; S2-S3 ventral primary rami
superior hypogastric plexus; pelvic splanchnics