Charles wants to survey recent customers about the quality of service they received at his small auto service dealership. He has customers' mailing and e-mail addresses. Charles will likely use an online survey primarily because it offers:

A. relatively low response rates.
B. the ability to share video with respondents.
C. the ability to ask sensitive questions with anonymity.
D. fast responses at a lower cost.
E. the opportunity to survey both existing and potential customers.