Let `v_(1)` be the frequency of series limit of Lyman series, `v_(2)` the frequency of the first line of Lyman series and `v_(3)` the frequency of series limit of Balmer series. Then which of the following is correct ?
A. `upsilon_(1)-upsilon_(2)=upsilon_(3)`
B. `upsilon_(2)-upsilon_(1)=upsilon_(3)`
C. `upsilon_(3)=1//2(upsilon_(1)-upsilon_(3))`
D. `upsilon_(1)+upsilon_(2)=upsilon_(3)`