Read the draft passage. Paragraph 1: A help-desk training packet explains what staff must do before resetting a password. The paragraph has already discussed why identity checks matter. Paragraph 2: The final sentence should introduce the required sequence and end with its longest step. Underlined sentence: "The packet requires staff to: verify the caller, document the request, and report suspected impersonation before resetting a password." Which revision uses the colon correctly and ends with the full three-action security sequence?