In the following pairs of OSI protocol layer/sub-layer and

In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is

1. Network layer and Routing
2. Data Link Layer and Bit synchronization
3. Transport layer and Endd-to-end process communication
4. Medium Access Control sub-layer and Channel sharing

Bit synchronization is handled by physical layer of OSI model and not Data Link Layer.