【多选题】
Which statements concerning the relationships between the following classes are true？（）  <br /> class Foo {  int num；  <br /> Baz comp = new Baz（）；  <br /> }  <br /> class Bar {  boolean flag；  <br /> }  <br /> class Baz extends Foo {  <br /> Bar thing = new Bar（）；  <br /> double limit；  <br /> }  
A、A Bar is a Baz.
B、A Foo has a Bar.
C、A Baz is a Foo.
D、A Foo is a Baz.
E、A Baz has a Bar.
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