Question: S - > AB , A - > Ca , B - > bD , C - > XY , D - > C ,

S->AB, A->Ca, B->bD, C->XY, D->C, X->aX|bX|null, Y->Ya|Yb|null
(Choose all that apply!)
Group of answer choices
only S
None is nullable non-terminal
only C and D
C, D, X, Y

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