Which of the following communication devices would also send and receive data via Bluetooth?

The selection of a network card as the correct answer is based on its ability to facilitate Bluetooth communication. Network cards are often equipped with wireless capabilities, which can include Bluetooth technology, allowing them to both send and receive data wirelessly. This functionality makes network cards versatile in handling various types of data transmission, beyond just traditional wired connections.

In contrast, the other devices listed—modems, routers, and switches—typically serve different primary functions related to network connectivity. Modems primarily convert digital data from a computer to analog for transmission over telephone lines and do not inherently support Bluetooth. Routers primarily manage network traffic between different devices but do not function as Bluetooth transmitters or receivers. Switches are designed to connect multiple devices on a local network by forwarding data packets, but they don't include any capability for Bluetooth communication.

Thus, the network card stands out as the device that can operate with Bluetooth technology, supporting both sending and receiving data wirelessly.