Which one of the following statements is correct?

Cyclohexadiene contains ${\mathrm{sp}}^3$carbon. Hence, it is not aromatic. For it to be an aromatic compound, all the carbon atoms must be ${\mathrm{sp}}^2$hybridized.

Deactivating groups are meta directing groups.

Benzene reacts with n-propyl chloride in presence of anhydrous ${\mathrm{AlCl}}_3$ leads to rearrangment, forming Isopropyl benzene.

Electrophilic substitution of benzene takes place via σ− complex or a stable arenium ion.