To avoid being intrusive and annoying, most legitimate e-mail marketers practice ______, which means sending e-mail pitches only to customers who "opt in."

To avoid being intrusive and annoying, most legitimate e-mail marketers practice ______, which means sending e-mail pitches only to customers who "opt in."


A. permission-based e-mail marketing
B. viral marketing
C. spamming
D. phishing
E. unsolicited e-mail marketing


Answer: A. permission-based e-mail marketing


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