A potentiometer experiment setup is shown in the given diagram. R is the point when there is no deflection in the galvanometer. $E_1$  is the source. Match the following.

	Column-I		Column-II
P)	If only emf of battery $E_1$ is increased	(1)	point R will shift to left
Q)	If only resistance offered by rheostat is increased	(2)	point R will shift to right
R)	If resistance box (RB) is connected and resistance of RB is increased.	(3)	point R will remain unchanged point R
S)	If an identical battery is connected in parallel to  E.	(4)	may shift to left or right