For a team of remote workers needing to access classified secured files and documents, the most optimal choice from the provided options would be a network operating system.
A network operating system facilitates file sharing and collaboration among users over a network, providing support for multiple users and the functionality necessary for accessing shared secured resources. This is essential for remote workers who require security and resource management across a shared network.
In contrast, the other options like batch operating systems, distributed operating systems, and real-time operating systems, do not specifically cater to the needs of network resource management and secure file sharing as effectively as a network operating system would.