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【单选题】
在面向对象程序设计中，常常将接口的定义与接口的实现相分离，可定义不同的类来实现相同的接口。在程序运行过程中，对该接口的调用可根据实际的对象类型调用其相应的实现。为达到上述目的，面向对象语言须提供(44)机制。A.
继承和过载(overloading)
B.
抽象类
C.
继承和重置(overriding)
D.
对象自身引用
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