What is the primary method used to send data over a network by dividing it into smaller packets?

The correct choice is based on the fundamental principle of how most networks manage the transmission of data. Packet switching is a method of data transmission used by networks that involves breaking down messages into smaller, manageable units called packets.

Each packet contains part of the data along with necessary information such as the destination address and sequencing details. This allows packets to travel independently across the network and be routed through various paths to their final destination. At the destination, the packets are then reassembled into the original message. This method is efficient and resilient, as it enables the network to utilize available bandwidth effectively and handle potential issues such as lost packets or varied network paths.

Other methods mentioned, such as data packet transfer, stream transfer protocol, and segmented sending, do not capture this core concept. While they may relate to data transmission in some way, they do not specifically refer to the technology of breaking down and routing data packets like packet switching does. This makes packet switching the primary and most recognized method for sending data over networks.