A radiactive sample decays by two different processes .Half - life for the first process is `t_(1)` and for the second process is `t_(2)` . The effective half-life is

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A. `T_(1//2)=(T_(1//2)^((1))+ T_(1//2)^((2)))/(T_(1//2)^((1))-T_(1//2)^((2)))`
B. `T_(1//2)=T_(1//2)^((1))+ T_(1//2)^((2))`
C. `T_(1//2)=(T_(1//2)^((1))T_(1//2)^((2)))/(T_(1//2)^((1))-T_(1//2)^((2)))`
D. None of the above