Which of the following is the most effective strategy for conducting an opt-in e-mail marketing campaign?

Which of the following is the most effective strategy for conducting an opt-in e-mail marketing campaign?

A.
Create an executable Java application as an e-mail attachment that describes the company.

B.
Send e-mail messages once a day to initial contacts for the first two weeks.

C.
Send e-mail messages once every two weeks to follow up on an initial contact.

D.
Create an executable ActiveX application as an e-mail attachment that describes the company.