Question: What are parse trees? a . Abstract representations of grammars. b . Recursive structures in BNF . c . Definitions in Backus - Naur Form.

What are parse trees?
a.
Abstract representations of grammars.
b.
Recursive structures in BNF.
c.
Definitions in Backus-Naur Form.
d.
Hierarchical syntactic structures of sentences.

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