Regarding the Three Phases of Gastrointestinal Control

Regarding the three phases of gastrointestinal control:

A) They refer to the places in the GI tract where digestion or absorption is occurring
B) They refer to the locations of receptors for stimuli that trigger hormonal or neural control mechanisms for GI processes
C) The presence of acid in the small intestine is one stimulus for the intestinal phase of GI control
D) Both they refer to the places in the GI tract where digestion or absorption is occurring and the presence of acid in the small intestine is one stimulus for the intestinal phase of GI control are correct
E) Both they refer to the locations of receptors for stimuli that trigger hormonal or neural control mechanisms for GI processes and the presence of acid in the small intestine is one stimulus for the intestinal phase of GI control are correct