Which of the following demonstrates proper protection of mobile devices?

The choice highlighting Linda encrypting all sensitive data on her government-issued mobile devices demonstrates the best practice for protecting mobile devices in a cybersecurity context. Encryption is a robust method of safeguarding data by converting it into a format that can only be read or decrypted by someone with the correct decryption key. This is particularly important for government-issued devices, which often contain sensitive and classified information.

By ensuring that data is encrypted, even if the device were to be lost or stolen, the information remains secure because unauthorized users would not be able to access the data without the necessary credentials. This proactive approach significantly mitigates the risk of data breaches and unauthorized access.

In contrast, the other options reflect practices that could lead to increased vulnerabilities. Storing devices in an unsecured location exposes them to theft or unauthorized access, sharing devices can result in unintentional data leaks and breaches, and using default passwords is a common security pitfall as these passwords can often be easily guessed or found online. Thus, encryption stands out as a critical measure for maintaining the integrity and confidentiality of sensitive information on mobile devices.