This question presumes a partial $($phrase$-$level$)$ analysis, not a full sentential $($S$)$ analysis. Assume you have access to the L$1$ grammar and lexicon plus one additional rule: NP $->$ Nominal.

Consider the phrase evening flights from Nashville to Houston that serve dinner. The constituency tree for this phrase adheres to which of the following constraints? $($Select the two correct constraints.$)$

Group of answer choices

The top node of the phrasal constituency tree cannot be NP because there is no Det to trigger this rule: NP $->$ Det Nominal.

In order to cover that serve dinner, the post$-$nominal modifier XP in "Nominal $->$ Nominal XP$"$ must be RelClause.

There are exactly four occurrences of $$Nominal$$ as internal nodes of the constituency tree.

Agreement rules are not applied in L$0,$ so there is no way to check that $$flights$$ agrees with the verb $$serve$$