Which of the following functions is not associated with a CNR?

A CNR, or Connection Networking Riser, is a type of expansion slot designed to accommodate certain types of multimedia and networking devices. It primarily supports functions that enhance audio, network connectivity, and modem capabilities.

The audio processing function is supported by the CNR for sound cards or audio hardware, which can result in better audio performance or the addition of sound capabilities to a computer system. Similarly, network connectivity functions are often associated with CNR, allowing for the integration of network adapters that improve or enable networking capabilities in a PC.

Modem functions also fit within the scope of CNR, enabling devices that provide internet connectivity through dial-up services or other modem-related capabilities.

In contrast, video functions are typically associated with different types of connections and slots, particularly those meant for graphics cards (like PCI Express). Video devices generally require more bandwidth and dedicated signaling from the motherboard than CNR provides. Thus, video processing is not a function commonly linked with CNR, making it the correct choice in this context.