Nanette teaches american history. she teaches both the advanced level and the regular level. in her powerpoint presentations, she typically uses the same slides but will leave several out for her regular-level class. which best describes the most efficient methods she should use to make her powerpoint presentation? \ she could use action buttons or make a custom powerpoint presentation. she could make a custom powerpoint presentation or make a new powerpoint presentation and delete unused slides. she could make a new powerpoint presentation and delete unused slides or skip through unnecessary slides. she could skip through unnecessary powerpoint slides or use action keys.