Condiser the reactions,
(i) `(CH_(3))_(2)CH-CH_(2)Broverset(C_(2)H_(5)OH)rarr(CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+HBr`
(ii) `(CH_(3))_(2)CH-CH_(2)Broverset(C_(2)H_(5)O^(-))rarr(CH_(3))_(2)CH-CH_(2)OC_(2)H_(5)+Br^(-)`
The mechanism of reactions (i) and (ii) are respectively :
A. `S_(N^(1)) and S_(N^(2))`
B. `S_(N^(1)) and S_(N^(1))`
C. `S_(N^(2)) and S_(N^(1))`
D. `S_(N^(2)) and S_(N^(2))`