Which of the following offers the best protection against identity theft?

Using two-factor authentication (2FA) offers the best protection against identity theft because it adds an additional layer of security to your accounts. When you enable 2FA, you not only need your password to access your account, but also a second form of verification, such as a code sent to your mobile device or a biometric scan. This significantly reduces the chances of unauthorized access, even if someone manages to obtain your password.

The other options do not provide effective measures for protecting against identity theft. Providing personal information freely can lead to it being misused by others. Sharing passwords with family members increases the risk that those passwords might fall into the wrong hands if the family member is not careful with them. Keeping financial records stored in one place may actually pose a risk if that location is compromised, as it centralizes sensitive information without the additional protections that broader security measures entail.