Which is a correct way to protect data privacy?

Correct answer: Obtain consent and use data only for the necessary purpose

A sound privacy practice is to obtain informed, appropriate consent and limit personal-data use to a clearly stated, necessary purpose. Good practice may also include access controls, secure storage, and deletion when data are no longer needed. Publishing private information, sharing passwords, or secretly selling personal data exposes people to misuse and security harm, so option A is the only responsible choice.