We have three resistances of values 2 Ω, 3 Ω and 6 Ω. Which of the following combination will give an effective resistance of 4 Ω?

• A. 2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance
• B. All the three resistances in parallel
• C. 6 Ω resistance in series with parallel combination of 2 Ω and 3 Ω resistance
• D. 3 Ω resistance in series with parallel combination of 2 Ω and 6 Ω resistance