Best audio formats for Rise and Storyline

So I have looked at several discussions that are several years old and I'm looking for some more current information. I have seen where people have problems with MP3 (various codecs, etc). I would like to know what is the best audio format to create for courses in RISE and STORYLINE. I assume MP3 for RISE since it is delivered over the web. 

I hear WAV 16 Bit 44KHZ PCM WAV files for Storyline. 

Do we do mono or stereo?

Would like a definitive answer as we are authoring 16 courses in the next month. 

What does Articulate recommend in 2018?

 

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