Given<br /> <img src="https://nimg.ppkao.com/2018-08/wenxueying/2018080115233680554.png?sign=b29ce16e074736ddd7066e3c47ab1004&t=62d41c0a" /><br /> Which two statements are true?()
A、Foo.beta() is a valid invocation of beta().
B、Foo.alpha() is a valid invocation of alpha().
C、Method beta() can directly call method alpha().
D、Method alpha() can directly call method beta().