Orgo EK lecture 1 - error?

[AG22]

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Hey guys, I think this might be an error, or a more likely explanation is that I am mistaken

The question states: When described using rectus or sinister, the spatial arrangement of substituents around a chiral atom is called: A- achirality B-absolute configuration C-observed roation D- enantiomeric purity.

I chose...C, but the answer is B. What do you all make of this? I think it's C. lol.

Muchas gracias!

EDIT. NEVER MIND!! It's actually B. whups.

 

[chemtopper]

It is B
Because R and S gives - absolute configuration of the molecule.