classSuperFoo{2.SuperFoodoStuff(intx){3.returnnewSuperFoo();4.}5.}6.7.classFooextendsSuperFoo{8.//insertcodehere9.}下面哪三项分别插入到第8行,可以编译?()
A、intdoStuff(){return42;}
B、intdoStuff(intx){return42;}
C、FoodoStuff(intx){returnnewFoo();}
D、SuperFoodoStuff(intx){returnnewFoo();}