To add a colored background to a selected cell or cells, click the _____ tab in the Format Cells dialog box.

Which of the following is NOT one of the three levels in the U.S. military data classification scheme for National Security Information?

A. confidential B. secret C. top secret D. for official use only

Email marketing relies on users to ____ to receive emails.

A. unsubscribe B. opt-in C. lurk D. moderate