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What does S/PDIF stand for?

  1. Sound/Playback Digital Interface

  2. Sony/Phillips Digital Interface

  3. Secure Playback Digital Interface Format

  4. Sound/Phillips Digital Interface Format

The correct answer is: Sony/Phillips Digital Interface

S/PDIF stands for Sony/Phillips Digital Interface, as it is a digital audio interface developed jointly by Sony and Philips. Option A is incorrect because it incorrectly names the acronym as "Sound/Playback" instead of "Sony/Phillips." Option C is incorrect because it adds the word "Secure" which is not part of the actual acronym. Option D is incorrect because it has the correct names but in an incorrect order - it should be "Sony/Phillips," not "Sound/Phillips."