Consider the following reaction sequence given below:
\[
CH_3CH_2Br
\xrightarrow[(ii)\ H_2O]{(i)\ A}
X
\xrightarrow{B}
C_6H_5CH_2CH_2OH
\]
Identify the pair of sets from the following in which A and B are present in order:
I. AgCN ; \(H_2/Pt\)
II. AgCN ; \(LiAlH_4,H_2O\)
III. KCN ; \(LiAlH_4,H_2O\)
IV. KCN ; \(B_2H_6\)