The methods that can be used to protect user internet privacy, to ensure the connection is encrypted, and to keep user activity hidden are proxy and MAC address randomization. A proxy is a server that acts as an intermediary between a user and the internet, hiding the user's IP address and location from websites and other online services. A proxy can also encrypt the connection between the user and the proxy server, preventing anyone from snooping on the user's traffic. MAC address randomization is a feature that changes the MAC address of a mobile device periodically or when connecting to different networks. A MAC address is a unique identifier of a network interface that can be used to track the device's location and activity. MAC address randomization can help protect the user's privacy by making it harder for third parties to link the device to a specific user or network. Verified Reference:
https://www.techtarget.com/searchsecurity/definition/proxy-server
https://www.techtarget.com/searchnetworking/definition/MAC-address-randomization
https://www.techtarget.com/searchsecurity/definition/MAC-address-Media-Access-Control-address

Stopping the Print Spooler service and setting the startup type to disabled is the best configuration change to harden a domain controller against lateral movement attacks. The Print Spooler service has been known to be vulnerable to remote code execution exploits that can allow attackers to gain access to domain controllers and other sensitive machines. Disabling this service can reduce the attack surface and prevent exploitation attempts.

Explanation
Dual control is a security principle that requires two or more authorized individuals to perform a task concurrently. This reduces the risk of fraud, error, or misuse of sensitive assets or information. Verified References: https://www.comptia.org/training/books/casp-cas-004-study-guide ,
https://www.isaca.org/resources/isaca-journal/issues/2018/volume-1/using-dual-control-to-mitigate-risk

Masking is a technique for obscuring sensitive data in a database by replacing it with fictitious data that has the same format and structure as the original data. Masking can be performed at the presentation layer, which means that it does not require any changes to the application itself.
This makes it an efficient solution for protecting the production environment, as it can be easily implemented without disrupting the existing system.
Tokenization is a technique for replacing sensitive data with a randomly generated value (a token) that has no intrinsic meaning and cannot be used to recreate the original data.
Tokenization can be used to protect data at the presentation layer, but it typically requires changes to the application to store and retrieve the tokens.