Question: For converting a specialization / generalization with 1 super class and 2 subclasses into GRD , if the constraints are { optional , and }

For converting a specialization/generalization with 1 super class and 2 subclasses into GRD, if the constraints are {optional,and}, then the number of relations in the corresponding GRD is
A.
2
B.
3
C.
1
D.
4

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