An Important Guideline to Be Followed in Conducting an E-Mail

An important guideline to be followed in conducting an e-mail campaign (to do it right) is to

A) update your e-mail lists once or twice a year.
B) offer something the customer could not get via direct mail.
C) make the consumer the same offering as in your direct-mail campaign.
D) personalize the e-mail with the subscribers first and last name.
E) make it difficult for the consumer to "unsubscribe" from your list.