If $\log _{10} 2, \log _{10} (2^x + 1), \log _{10} (2^x + 3)$ are in $A.P.,$ then :-
If $\log _{10} 2, \log _{10} (2^x + 1), \log _{10} (2^x + 3)$ are in $A.P.,$ then :-
- A
$x = 0$
- B
$x = 1$
- C
$x = \log _{10} 2$
- D
$x = \frac{1}{2} \log _2 5$
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- [IIT 2011]