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The marketing department has developed a new marketing campaign involving significant social media outreach. The campaign employees and customers to submit blog posts and pictures of their day to day experiences at the company The info includes allowing been asked to provide an informative letter to all participants regarding the security risks and how to avoid privacy and operational security issues Which of the following is the MOST important information to reference in the letter? After-action reports from prior incidents Social engineering techniques Company policies and employee NDAs Data classification processes