20. Given the following class definition:

public class DerivedDemo extends Demo
{
int M, N, L ;
public DerivedDemo( int x, int y )
{
M = x ; N = y ;
}
public DerivedDemo( int x )
{
super( x );
}
}

Which of the following constructor signatures MUST exist
in the Demo class for DerivedDemo to compile correctly?

Select 2 correct answers:
A. public Demo( int a, int b )
B. public Demo( int c )
C. public Demo( )