If `N_(t) = N_(o)e^(lambdat)` then number of disintefrated atoms between `t_(1)` to `t_(2) (t_(2) gt t_(1))` will ve :-
A. `N_(o)[e^(lambdat_(2))-e^(lambdat_(3))]`
B. `N_(o)[-e^(lambdat_(2)) - e^(-lambdat_(1))]`
C. `N_(o)[e^(-lambdat_(1)) - e^(-lambdat_(2))]`
D. None of these