"class aggregate" is incorrect. choose the correct line so that this program prints:

granite: weight=25.0 value=4 numkind=7
public class inherit
{
abstract class stone
{
protected float weight = 13;
protected int value = 4;
abstract public string tostring( );
}
class aggregate
{
protected int numkind;
}
class granite extends aggregate
{
granite( )
{
weight = 25; numkind = 7;
}
public string tostring( )
{
return "granite: weight="
+ weight + " value="
+ value + " numkind="
+ numkind;
}
}
inherit( )
{
granite g = new granite( );
system. out. println(g);
}
public static void main(string[ ] args)
{
new inherit( );
}
}
a) abstract class aggregate {
b) abstract class aggregate extends granite {
c) abstract class aggregate extends stone {
d) class aggregate extends stone {
e) none of the above