What Distinguishes a Door to Door Salesperson from a Telemarketer

What distinguishes a door to door salesperson from a telemarketer?

A) Licensing requirements for telemarketers are regulated by anticompetition legislation.
B) Consumer protection legislation requires individual licences for each telemarketer.
C) Licensing requirements for door to door selling are regulated by consumer protection legislation.
D) Anticompetition legislation requires licensing of door to door sales forces.