Three resistance of values `2Omega,3Omega` and ` 6Omega` are to be connected to produce an effective resistance of `4Omega`. This can be done by connecting.
A. `3Omega` resistance in series with the parallel combination of `2Omega` and `6Omega`.
B. `6Omega` resistance in series with the parallel combination of `2Omega` and `3Omega`
C. `2Omega` resistance in series with the parallel combination of `3Omega` and `6Omega`
D. `2Omega` resistance in parallel with the parallel combination of `3Omega` and `6Omega`.