Mono Means Which Speakers?

[Damage Inc.]

I have a quick question here:

I just came across a BD-release that shows here that it has 'LPCM Mono'.
No, I don't have this BD (yet), so I can't try it out.
But I was really wondering, if it's mono, and you have a speaker-setup that's more than 2.1, which speaker(s) will that track use?
Will it just utilize the center speaker, as it's one channel and (hopefully) centered.
Or will it actually use 2.0/1 and it's just audio without any panning (so no stereo)?

Or, otherwise, does this even differ among mono-tracks?
As in, that different tracks on different BDs that are called mono, can either be 1.0 or even 2.0 or 2.1,
but still sound like mono because there is just nothing more to it.