The underlined part of the sentence needs a comma because it is a restrictive clause. is correctly punctuated because it is a restrictive clause. needs a comma because it is a nonrestrictive clause. is correctly punctuated because it is a nonrestrictive clause.

It is a part of the sentence that explains a previously presented term.
It is a part of the sentence that adds extra information;
It is a part of the sentence that can be deleted without compromising the meaning.

An example of a restrictive clause is this sentence: "His dark eyes, black as night, reflected the light of the room." In this sentence, the clause "black as night" is a restrictive clause, as it adds information, can be removed from the sentence, and explains the term "dark eyes," in addition to being positioned between two commas.

Your question is incomplete, as you didn't show the sentence it refers to. However, taking into account the context of your question, I have shown an explanation of how a restrictive clause should be presented to help you answer your question correctly.

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