Baroreceptor reflex

What is the role of the medulla (solitary nucleus) in the baroreceptor reflex?

1: It generates the initial response to changes in blood pressure.
2: It serves as the primary site for the synthesis of neurotransmitters involved in blood pressure regulation.
3: It integrates information from baroreceptors and directs SNS/PNS outflow to the heart and blood vessels.
4: It acts as a relay center for pain signals associated with high blood pressure.