The function designed to keep internet users safe from your options is privacy settings.
- Privacy settings allow users to control who can see their information and limit exposure to potential risks online.
Netiquette refers to the etiquette guidelines for online communication, which can promote respectful interactions but is not specifically a safety feature.
Digital footprints are records of online activity and can impact privacy and safety but are not a protective function in themselves.
Formal settings is not relevant to internet safety.
So, the correct answer is privacy settings.