Q. what should be arrangement of the three resistors to get 5 ohm as equivalent resistance?

1. 2,4,6 are in parallel
2. 2 and 4 ohm resistor in parallel with 6 ohm in series
3. 2 and 6 ohm resistor in parallel with 4 ohm in series
4. 4 and 6 ohm resistor in parallel with 2 ohm in series