Which of the following units of data does the data-link layer send from the network layer to the physical layer of the OSI model?

Protocols are sets of rules, not a unit of data exchanged between OSI layers - each layer has a specific PDU type.

Raw bits are the PDU of the physical layer (Layer 1), which is below the data-link layer, not above it.

Data packets are the PDU of the network layer (Layer 3), which is the layer above the data-link layer that hands data down to it.

The data-link layer's protocol data unit (PDU) is the frame. It receives packets from the network layer, encapsulates them by adding a header containing MAC addresses and a trailer for error detection (such as CRC), forming a frame. This frame is then passed to the physical layer, which converts it to raw bits for transmission over the physical medium.

Data segments are the PDU of the transport layer (Layer 4), two layers above the data-link layer in the OSI model.