Question: Find all the useless non - terminals from the given CFG: S - > XS | b; X - > YZ; Z - > XY;

Find all the useless non-terminals from the given CFG: S->XS | b; X->YZ; Z->XY; X->ab
Group of answer choices
Y, Z
Z
all non-terminals are useful.
S, X, Y, Z
X, Y, Z

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