多項(xiàng)選擇題

10. class Foo { 
11. static void alpha() { /* more code here */ } 
12. void beta() { /* more code here */ } 
13. } 
Which two 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().

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