In the transportation cockpit of SAP S/4HANA Transportation Management, driver assignment is a key planning activity for companies operating their own fleet. According to the SAP documentation, drivers can be assigned to:

Vehicle resource (B): Drivers are assigned to vehicle resources in the master data or during planning in the transportation cockpit, linking a driver to a specific truck.

Freight order header (D): Drivers can be assigned at the freight order header level in the transportation cockpit to specify who will operate the transport for the entire freight order.

The other options are incorrect:

Freight order stage (A)is not typically used for driver assignment; assignments are made at the freight order or vehicle level.

Freight unit header (C)represents the goods being transported and does not support driver assignment.