Consider the following class definitions, public class C$1\{$ private int num; private String name; public C$1($int theNum$)\{$ num $=$ theNum; $\}$ public C$1($String theName$)\{$ name $=$ theName; $\}//$ other methods not shown $\}$ public class C$2$ extends C$1\{//$ methods not shown $\}$ Which of the following constructors are valid for C$2?$ I. public C$2()\{\}$ II$.$ public C$2($int quan$)\{$ super $($quan$)$; $\}$ III. public C$2($String label$)\{$ super $($label$)$; $\}$ II only II and III None of the above III only All three are valid