Question

______ marketing usually occurs when customers have subscribed to receive promotional materials. newspaper television email mail

Explanation:

Email marketing typically involves sending promotional materials to customers who have subscribed to receive them. Newspaper and television are mass - media advertising channels not specifically tied to customer subscription for promotional materials. Mail can be used for unsolicited (junk mail) or solicited, but email is more commonly associated with subscription - based promotional material delivery in the digital age.

Answer:

Email