Definition: 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'.
Input: Question: The secretion of insulin by pancreatic cells is regulated positively by: 
 Options:  <1> Inhibition of hexokinase IV. <2> Activation of K + channels. <3> Inactivation of Ca ++ channels. <4> High concentration of ATP. <5> Low blood glucose levels
