Two batteries with e.m.f. 12 V and 13 V are connected in parallel across a load resistor of 10Ω . The internal resistances of the two batteries are 1Ω and 2Ω respectively. The voltage across the load lies between:
a. 11.6 V and 11.7 V
b. 11.5 V and 11.6 V
c. 11.4 V and 11.5 V
d. 11.7 V and 11.8 V