Question: What does an asterisk ( * ) mean in rewrite rules NP = > ( Det ) ( Adj ) * N and VP =

What does an asterisk (*) mean in rewrite rules NP =>(Det)(Adj)*N and VP => V (NP)(PP)*?
Group of answer choices
the phrase is ungrammatical
the element is optional
the phrase can have more than one of these elements
the element with the asterisk is the head of the phrase
None of the answers is correct

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