9 Consider the below DAG. You are interested in the effect of D on YE a. What is type of variable is M?9 b. What is a list of viable control sets when B is unobservablefm c. Now suppose D=isolation from pandemic lockdown, Y=depression, T=married, B=time spent speaking with loved ones , M=Social acuity. Do you think the arrows are pointing in the correct directions, why or why not?9 d. Suggest some variables this model might be missing, draw them into the model.e 6| .0? ............... p B9 6' : Te : s :- e 2Y9 6| 6| 6| 6| 6|