A technician needs to transfer a file to a user's workstation. Which of the following would best accomplish this task utilizing the workstation's built-in protocols?

VPN (Virtual Private Network) creates a secure tunnel over an insecure network; it is a connectivity method, not a file transfer protocol itself.

Server Message Block (SMB) is a network file sharing protocol built into Windows workstations that allows files and printers to be shared across a network. A technician can use SMB by accessing a shared folder on the user's workstation or sharing a folder from their own system to easily transfer files.

RMM (Remote Monitoring and Management) refers to a suite of tools for managing remote systems and might include file transfer capabilities, but it's an application solution, not a built-in protocol for file transfer.

MSRA (Microsoft Remote Assistance) is a feature for remote control and viewing, which can involve file transfer, but SMB is the underlying protocol for direct file sharing over the network.