A battery has an e.m.f 12 V and internal resistance $2 \Omega$. This battery is connected to a variable resistor 0 to $5 \Omega$. The value of current for which the rate of heat production in the resistor is maximum:

2 A 3 A 6 A $\frac{12}{7}$ A

3 A

The correct answer is Option (2) → 3 A