以下哪个接口的定义是正确的?(<br/>) A: interface Ipic {<br/>void print() { } ;} B: abstract interface Ipic {<br/>void print() ;} C: abstract interface Ipic extends I1 //I1为已定义的接口 {<br/>abstract void print(){ };} D: interface Ipic {<br/>void print();}