Benzene on nitration gives nitrobenzene in presence of ${\mathrm{HNO}}_3$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ mixture, where

Both ${\mathrm{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{HNO}}_3$ act as a bases.

Both ${\text{H}}_2{\mathrm{SO}}_4$ and ${\mathrm{HNO}}_3$ act as an acids.

${\mathrm{HNO}}_3$ acts as an acid, ${\text{H}}_2{\mathrm{SO}}_4$ acts as a base.

${\mathrm{HNO}}_3$ acts as a base, ${\mathrm{H}}_2{\mathrm{SO}}_4$ acts as an acid.