Which practice improves online security and privacy?

• A. Post all your daily routines
• B. Share your passwords with trusted friends
• C. Use the same password for every site
• D. Use two-factor authentication and strong unique passwords

Answer: (D)

Layered authentication with unique credentials is the strongest defense for online accounts. Using two-factor authentication adds a second hurdle beyond the password, typically a code from an authenticator app or a hardware key. Even if someone learns your password, they can't log in without the second factor, which significantly reduces the chance of account takeover. Pairing that with strong, unique passwords for each site means a breach at one site won’t endanger your other accounts, since each account has its own robust credential. This approach protects both access and privacy by limiting how much data can be exposed if one credential is compromised. For best results, enable two-factor authentication on services you use and use a password manager to generate and store strong unique passwords. Avoid posting daily routines or sharing passwords, and never reuse passwords across sites.