What is the output of the following program?

class ThreadTest extends Thread $\{$

public void run$()\{$

for$($int i $=0$; i $<3$; i$++)\{$

System.out.println$("$A$")$;

System.out.println$("$B$")$;

$\}$

$\}$

$\}$

class ThreadDemo extends Thread $\{$

public void run$()\{$

for$($int i $=0$; i $<3$; i$++)\{$

System.out.println$("$C$")$;

System.out.println$("$D$")$;

$\}$

$\}$

public static void main$($String args$[])\{$

ThreadTest t$1=$ new ThreadTest$()$;

ThreadDemo t$2=$ new ThreadDemo$()$;

t$1.$start$()$;

t$2.$start$()$;

$\}$

$\}$

Question $6$ options:

Will print in this order ABCD...ABCD...

Will print A B C D but we cannot predict the Order in which this will be printed.

Will print in this order AB CD AB$...$

Compile time Error There is no start$()$ method.