Question: When is a grammar said to be ambiguous? a . When it generates sentences with more than one distinct parse tree. b . When it

When is a grammar said to be ambiguous?
a.
When it generates sentences with more than one distinct parse tree.
b.
When it has a single parse tree for every sentence.
c.
When it cannot generate any sentences.
d.
When it has only one leftmost derivation.

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