For the Paschen series thr values of `n_(1)` and `n_(2)` in the expression `Delta E = R_(H)c [(1)/(n_(1)^(2))-(1)/(n_(2)^(2))]` are
A. `n_(1)=1,n_(2)=2,3,4` . . .
B. `n_(1)=2,n_(2)=3,4,5` . . .
C. `n_(1)=3,n_(2)=4,5,6` . . .
D. `n_(1)=4,n_(2)=5,6,7` . .
