What does the following Java code display on the screen?

int rows $=4$;

String output $=""$;

for $($int i $=0$; i $<$ rows; i$++)$

$\{$

output $=$ output $+$ i;

for $($int j $=0$; j $<$ i; j$++)$

output $=$ output $+"*"$;

$\}$

System.out.print$($output$)$;

Question $9$ Answer

a$.$

$0*1*2*3*$

b$.$

$01*2**3***$

c$.$

$01*2**3***4****$

d$.$

$0***1***2***3***$

e$.$

None of the above