Given: public abstract interface Frobnicate { public void twiddle(String s); } Which is a correct class?

A、publicabstractclassFrobimplementsFrobnicate{ publicabstractvoidtwiddle(Strings){} };
B、publicabstractclassFrobimplementsFrobnicate{};
C、publicclassFrobextendsFrobnicate{ publicvoidtwiddle(Integeri){} };
D、publicclassFrobimplementsFrobnicate{ publicvoidtwiddle(Integeri){} }