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