I want to know the answer to the following question:
How many 5.1 surround sound options exist in LaserDiscs?
All the background I'm provided with is that "Many 1990s A/V receivers combine the AC-3 decoder and DTS decoder logic, but an integrated AC-3 demodulator is rare both in LaserDisc players and in later A/V receivers.". Is that enough to answer the question?