In a Wheatstone?s bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is [CBSE PMT 2003]

• A.         \[\frac{R}{2}\]              
• B.         R
• C.         2 R                                    
• D.         \[\frac{R}{4}\]