Which of the following is a method to enhance online security?

Implementing two-factor authentication is a robust method to enhance online security because it adds an additional layer of protection beyond just a username and password. This means that even if someone manages to obtain your password, they will still need a second form of verification, which is typically something you have (like a smartphone) or something you are (like a fingerprint). This significantly reduces the risk of unauthorized access to your accounts, making it much harder for cybercriminals to break in.

In contrast, using simple passwords can easily make accounts vulnerable to attacks, while connecting to free Wi-Fi without precautions can expose devices to various security risks such as man-in-the-middle attacks. Sharing passwords through email can lead to unintentional exposure and theft, as emails may not always be securely encrypted. Thus, two-factor authentication stands out as a critical security measure in protecting online accounts effectively.