Which configuration allows multiple sources to connect through a single AV output?

The matrix configuration is the correct choice because it enables multiple sources to connect to multiple outputs, allowing for flexible routing of audio and video signals. In this setup, any input can be directed to any output, which is particularly useful in complex systems where different sources may need to be sent to various displays or speakers at different times. This configuration offers versatility and control, making it ideal for environments like control rooms, conference centers, or large venues where multiple presentations might occur simultaneously.

Other configurations, such as point-to-point, multicast, and bus configurations, do not provide the same level of flexibility in connecting multiple sources to a single output. A point-to-point configuration typically links one source directly to one output, which limits its capability for complex setups. Multicast configurations are more oriented towards network transmission of signals to multiple recipients rather than routing them to individual outputs. A bus configuration typically involves a single pathway for signals to travel, which does not allow for the independent routing of multiple sources to various outputs as seen in a matrix configuration.