Column-$I$ gives certain physical quantities associated with the flow of current through a metallic conductor. Column-$II$ gives some mathematical relations involving electrical quantities. Match Column-$I$ and Column-$II$ with appropriate relations.

$A$. Mobility	$P$. $\frac{m}{ne^2 \rho}$
$B$. Electrical conductivity	$Q$. $neAv_{d}$
$C$. Relaxation period	$R$. $\frac{v_{d}}{E}$
$D$. Current	$S$. $\frac{J}{E}$

• A
  $A \rightarrow R ; B \rightarrow S ; C \rightarrow P ; D \rightarrow Q$
• B
  $A \rightarrow R ; B \rightarrow S ; C \rightarrow Q ; D \rightarrow P$
• C
  $A \rightarrow R ; B \rightarrow P ; C \rightarrow S ; D \rightarrow Q$
• D
  $A \rightarrow R ; B \rightarrow Q ; C \rightarrow S ; D \rightarrow P$