Which port would indicate digital audio support on a motherboard?

The option that indicates digital audio support on a motherboard is S/PDIF. S/PDIF, which stands for Sony/Philips Digital Interface, is specifically designed for transmitting high-quality digital audio signals. It supports both stereo and multichannel audio formats, making it an ideal choice for connecting to audio devices, such as speakers or home theater systems, that require high-fidelity sound.

While HDMI also supports digital audio and video signals, it is primarily known for its video capabilities, and not all motherboards may include HDMI ports. USB-C is a versatile port that can carry various types of data, including audio, but it is less commonly associated with traditional audio output than S/PDIF. VGA, on the other hand, is an analog video interface and does not support audio transmission. Thus, S/PDIF is recognized as the dedicated port for digital audio support on motherboards.