Final answer:Some actions that are not best practices for preventing intruders include allowing others into the building behind you, keeping blinds and curtains closed, and covering interior windows. Best practices include reporting suspicious activities, never propping open exterior doors, and ensuring visitors have badges.Explanation:Don't let others into the building behind you:This is not a best practice as it allows unauthorized access to the building. Each person should use their own access credentials.Keep blinds and curtains closed:While this may provide privacy, it does not directly prevent intruders from gaining access to the building.Cover interior windows at all times:Similarly to keeping blinds and curtains closed, covering interior windows does not directly prevent intrusion. It may hinder visibility, but intruders can still find other ways to enter the premises.Report anything that seems suspicious:This is a best practice as it helps identify potential security threats and allows appropriate actions to be taken.Never prop open exterior doors:This is a best practice to prevent unauthorized access. Doors should always be properly closed and secured.Make sure visitors have a badge:This is another best practice to ensure that only authorized individuals have access to the building.Learn more about Preventing intruders from gaining access here:brainly.com/question/31201093...

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