对于如下所示的序列图所描述的场景，最适合于采用的设计模式是（ ）；该模式适用的场合是（ ）。
问题1选项
A.Visitor
B.Strategy
C.Observer
D.State
问题2选项
A.对象的行为决定于它的状态，且必须在运行时刻根据状态改变它的行为
B.定义对象结构的类很少改变，但经常需要在此结构上定义新的操作
C.需要使用一个算法的不同变体
D.一个对象必须通知其他对象，而它又不能假定其他对象是谁
正确答案及解析
正确答案
解析
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