Which statements concerning the switch construct are true？（）  A、All switch statements must have a default label.B、There must be exactly one label for each code segment in a switch statement.C、The keyword continue can never occur within the body of a switc

Which statements concerning the switch construct are true？（）  

• A、All switch statements must have a default label.
• B、There must be exactly one label for each code segment in a switch statement.
• C、The keyword continue can never occur within the body of a switch statement.
• D、No case label may follow a default label within a single switch statement.
• E、A character literal can be used as a value for a case label.