In order for feces to pass through the anal canal during defecation, there is a
(a) voluntary relaxation of both the internal and externalanal sphincters.
(b) involuntary relaxation of both the internal and externalanal sphincters.
(c) voluntary relaxation of the internal anal sphincter andinvoluntary relaxation of the external sphincter.
(d) involuntary relaxation of the internal anal sphincter andvoluntary relaxation of the external anal sphincter
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