What should be the value of Rv and R4 for the bridge to be balanced?(Given that: R1=4 ohm, R3=8 ohm,)

• A. Rv = 3 ohm, R4 = 4 ohm
• B. Rv = 2 ohm, R4 = 4 ohm
• C. Rv = 6 ohm, R4 = 5 ohm
• D. Rv = 1 ohm, R4 = 7 ohm