Given:Whichtwocodefragments insertedindependentlyatline3 generatetheoutput4247?()

A、Strings="123456789";s=(s-"123").replace(1,3,"24")-"89";
B、StringBuffers=newStringBuffer("123456789");
C、sdelete(0,3).replace(1,3,";24";).delete(4,6);
D、substring(3,6).delete(1,3).insert(1, ";24";);