Benzene on nitration gives nitrobenzene in presence of HNO3 and H2SO4 mixture, where :
(1) both H2SO4 and HNO3 act as a bases
(2) HNO3 acts as an acid and H2SO4 acts as a base
(3) both H2SO4 and HNO3 act as an acids
(4) HNO3 acts as a base and H2SO4 acts as an acid