U2720Q, which mode is the factory calibration?

It's said that "every Dell U2720Q is shipped incorporating pre-tuned standard mode(sRGB) with average Delta-E ≤2.".

So which Color > Preset Mode is the above factory calibration referring to exactly? Standard mode or sRGB mode?

I'm confused with Dell's choice of words probably. If Standard mode is the factory calibration mode, is it therefore calibrated to sRGB? So what is sRGB mode then?

Thank you.