![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
判断下列类MyClass 的定义中哪些是合法的抽象类? A. abstract class MyClass { public abstract int getCount(); } B. abstract class MyClass { abstract int getCount(); } C. private abstract class MyClass { abstract int getCount(); } D. sealed abstract class MyClass { abstract int getCount(); }