Which practice is a suggested prevention method against man-in-the-middle attacks?

Using encrypted Wi-Fi for all connections is a suggested prevention method against man-in-the-middle attacks because encryption helps secure the data being transmitted over the network. When data is encrypted, even if an attacker intercepts the communication, they will not be able to easily read or manipulate the information without the appropriate decryption key.

In the context of a man-in-the-middle attack, an attacker attempts to intercept or alter communications between two parties who believe they are directly communicating with each other. By utilizing an encrypted connection, such as WPA2 or VPNs, users can ensure that their data remains confidential and integral, making it significantly more difficult for an attacker to successfully execute such an attack.

The other options, while they may improve overall security, do not specifically address the risk posed by man-in-the-middle attacks in the same direct way that encrypted Wi-Fi does.