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Which port on a motherboard indicates support for built-in digital audio output?

  1. HDMI

  2. USB

  3. SATA

  4. S/PDIF

The correct answer is: S/PDIF

The presence of an S/PDIF (Sony/Philips Digital Interface) port on a motherboard is a clear indication of built-in support for digital audio output. S/PDIF is a standard for transmitting high-quality digital audio signals between devices, eliminating any analog conversion that could degrade sound quality. This port typically allows for connection to external audio systems, such as home theater receivers and sound systems, ensuring that audio can be transmitted without loss in fidelity. Other ports mentioned serve different purposes. HDMI, while it does carry digital audio along with video, is primarily known for video output capabilities. Similarly, USB ports are versatile and can handle various data types, including audio, but they are not specifically dedicated to audio output in the same way as S/PDIF. SATA ports are used for data storage connections and do not relate to audio output capabilities. Therefore, the presence of an S/PDIF port is the most direct indication of built-in support for digital audio output on a motherboard.