Which of the statements are correct about `D,L` of sugars and amino acids.

Options

A. In sugars, symbols D and L refer to the relative configuration of the OH groups at the penultimate C atom w.r.t. to glyceraldehyde taken as standard. D refers to `(-OH)` group on R.H.S. and L refres to OH group on L.H.S.
B. In amino acids, symbols D and L refer to the relative configuration of the `(NH_(2))` group w.r.t. D (+) serine taken as standard [D (+) Serine].
C. D refers to `NH_(2)` group on R.H.S. and L refers to `(-NH_(2))` group on L.H.S.
D. In sugars, d refers to dextrorotatory and L refers to laevoratotory.

Answer

A, B