Which of the Following Statements Is True About Trade Dress

Which of the following statements is true about trade dress?

A) The main focus of a case of trade-dress infringement is usually on whether the trade dress is primarily functional.
B) One of the elements that a party must prove to succeed on a claim of trade-dress infringement is that the alleged infringement creates a likelihood of confusion.
C) Trade dress is entitled to lesser protection than a trademark.
D) Trade dress must be registered to receive protection from the law.