Choose the correct option from the following :
A. In the electrophilic substitution of toluene with `Br_2`,iron (III) brinude acts as a Lewis acid.
B. In the reaction of toluene with `Cl_2//FeCl_3`, ortho and para isomers are easily separated.
C. Similar reaction with iodine is reversible in nature.
D. All of these.