What is a common method to secure sensitive data on a laptop?

Encrypting the hard drive is a robust method for securing sensitive data on a laptop because it protects the data by converting it into a format that is unreadable without the appropriate decryption key. This means that even if someone gains physical access to the laptop or the hard drive itself, they cannot retrieve or access the data without the key. Encryption adds a crucial layer of security that is vital in today's environment, where data breaches and theft are common concerns.

While disabling Wi-Fi access can enhance security when the device is not in use, it does not protect the data stored on the laptop itself. Likewise, using password protection is a necessary step for security; however, relying solely on passwords can be insufficient against various attacks, such as brute force or social engineering. Changing the desktop wallpaper has no relevance to data security and does not contribute to protecting sensitive information. Hence, encrypting the hard drive stands out as the most effective method among the options presented.