Two batteries of emf 4 V and 8 V with internal resistance 1 Ω and 2 Ω are connected in a circuit with resistance of 9 Ω as shown in figure. The current and potential difference between the points P and Q are
(a) 1/3 A and 3 V
(b) 1/6 A and 4 V
(c) 1/9 A and 9 V
(d) 1/12 A and 12 V
