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Match Column-I with Column-II and select the correct answer from the codes given below.
\begin{tabular}{|l|l|l|l|}
\hline & \multicolumn{1}{|c|}{ Column-I } & & \multicolumn{1}{|c|}{ Column-II } \\
\hline A & The stage in which physical treatment of sewage is done & (i) & Anaerobic digestion of activated sludge and production of biogas \\
\hline B & The stae in which biological treatment of sewage is done & (ii) & Activated sludge \\
\hline C & Name of the sediment in primary treatment & (iii) & Aeration tanks \\
\hline D & It is carried to acration tanks from primary settling & (iv) & Primary cffluent \\
\hline E & Name of thie sediment in secondary treatment & (v) & Primary sludge \\
\hline F & Site of flocs growth & (vi) & Secondary treatment \\
\hline G & Function of sludge digester & (vii) & Primary treatment \\
\hline
\end{tabular}
(1) A-(vii), B-(vi), C-(v), D-(iv), (E)-(ii), F-(iii), G-(i)
(2) A-(i), B-(iii), C-(v), D-(vii), (E)-(ii), F-(iv), G-(vi)
(3) A-(i), B-(ii), C-(iii), D-(iv), (E)-(v), F-(vi), G-(vii)
(4) A-(vii), B-(vi), C-(i), D-(ii), (E)-(iii), F-(iv), G-(v)
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