Which of the following is a characteristic of a sequence?（）

• A、A sequence will never generate duplicate values
• B、The MAXVALUE of a sequence can be equal to the MINVALUE
• C、It is not possible to create a sequence that generates a constant since the INCREMENT value must be greater than zero
• D、When a sequence cycles back to either the MAXVALUE or MINVALUE, it will always be equal to the specified value of either of these two boundaries