Outline the complete mechanism of protonation for phenyl ether oxygen when treated with HBr.

The oxygen atom is reduced, converting the ether into an alcohol.

The oxygen atom shares electrons with bromine, creating a stable compound.

The oxygen atom undergoes oxidation, leading to the formation of a bromine radical.

The oxygen atom accepts a proton from HBr, forming a positively charged species that facilitates nucleophilic attack.