1.publicinterfaceA{2.publicvoiddoSomething（Stringthing）；3.}1.publicclassAImplimplementsA{2.publicvoiddoSomething（Stringmsg）{}3.}1.publicclassB{2.publicAdoit（）{3.//morecodehere4.}5.6.publicStringexecute（）{7.//morecodehere8.}9.}1.publicclassCextendsB{2.publ

1.publicinterfaceA{

2.publicvoiddoSomething（Stringthing）；

3.}

1.publicclassAImplimplementsA{

2.publicvoiddoSomething（Stringmsg）{}

3.}

1.publicclassB{

2.publicAdoit（）{

3.//morecodehere

4.}

5.

6.publicStringexecute（）{

7.//morecodehere

8.}

9.}

1.publicclassCextendsB{

2.publicAImpldoit（）{

3.//morecodehere

4.}

5.

6.publicObjectexecute（）{

7.//morecodehere

8.}

9.}

Whichstatementistrueabouttheclassesandinterfacesintheexhibit？（）