假设选修课程数目的输入范围为1-4,则根据黑盒测试中的等价类划分技术,下列划分正确的是()。
A.2个有效等价类,2个无效等价类
B.1个有效等价类,2个无效等价类
C.2个有效等价类,1个无效等价类
D.1个有效等价类,1个无效等价类
正确答案是B
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