单项选择题

使用C#进行编程过程中,在类MyClass的定义中,属于合法的抽象类的是()

A.abstract class MyClass {public abstract int getCount();}
B.abstract class MyClass {public virtual abstract int getCount();}
C.abstract class MyClass {private abstract int getCount();}
D.abstract class MyClass {public static abstract int getCount();}