Which of the following is true about Sequence frames?

• A. a sequence diagram has a frame consisting of a rectangle with a pentagon inits upper left-hand corner
• B. the pentagon is its name compartment ; the interaction is represented inside the rectangle.
• C. the string in the name compartment has the form sd interaction identifier where interaction identifier is either a simple name or an operation specification with the same format as in a class diagram
• D. all of the mentioned