Final answer:
To share proprietary information with a supervisor, a government employee should use a secure file sharing platform, ensuring the protection of the data with strong security measures.
Step-by-step explanation:
The most appropriate way for a government employee to share a document containing proprietary information with a supervisor would be to upload the document to a secure file sharing platform. This method ensures that sensitive data is protected through various security measures that these platforms typically provide, such as encryption and access controls.
Sending the document via email or through a messaging app can be risky as these forms of communication are more susceptible to interception. Printing the document and handing it over in person might be secure, but it is less efficient and could pose a risk if the document gets lost or is seen by unauthorized individuals. Communication in professional settings requires careful consideration of the confidentiality and security of the information being handled, especially in a government context where proprietary information could be very sensitive.