What punctuation rule is illustrated by the following phrase? Dear Mr. President: Use a colon after formal business letter salutations. Use a colon before business letter salutations. Use a semicolon after business letter salutations.
Explanation: This is an opening salutation of a formal business letter. Place a colon after the end of the salutation, not a semicolon. A comma is used only after an opening salutation in an e-mail.