Consider the following operation in respect of Wheatstone bridge (Kb, denotes battery key, Kg denotes galvanometer key)1. open Kb2. close Kg3. close Kb4. open Kg The correct sequence of operations is

• A. 1, 2, 3, 4
• B. 3, 1, 2, 4
• C. 4, 3, 2, 1
• D. 3, 2, 4, 1