A. It is set off by commas.
B. It contains a subject and a verb.
D. It adds nonessential information to the sentence.
The statements that describe characteristics of a restrictive clause is It is set off by commas, It contains a subject and a verb and It adds non-essential information to the sentence.
Restrictive clauses constrain the conceivable meaning of a going before subject.
Nonrestrictive clauses tell you something approximately a going before subject, but they don't restrain, or limit, the meaning of that subject.
Thus, the correct answer is A, B, and D.
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