2. What are the two methods of representing a set? A Empty method and Roster Method C. Rule Method and Empty Method B. Universal Method and Rule Method D. Roster Method and Rule Method 3. When are two sets are equal? A. If every element of A is an element of B and every element of B is an element of A B. If every element of Als an element of B and every element of B is not an element of A. C. If every element of Ais not an element of B and every element of B is an element of A. D. None of the above​