Q: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Question: Beta-adrenergic receptor blocking drugs:
Options: <1> They cause hypotension in individuals with normal blood pressure. <2> They increase the atrio-ventricular conduction velocity. <3> They cause negative inotropism. <4> They provoke a positive chronotropic effect. <5> They increase the secretion of renin.
A:
3