Which of the following blocks of code outputs

$12345$

$?$

for $($int $i=0$;$i<mn\; id="EditorElement\_511057">5</mn>$;$i++)$

I

cout ;

$\}$

int $j=1$;

while $)<mi\; id="EditorElement\_510950">(</mi><mn\; id="EditorElement\_510944">6</mn>$

$\{$

cout $j""$;

j$++$;

$\}$

int $k=0$;

do

$\{$

cout $(\frac{k}{2}+1)"$;

$k+=2$

$\}$ while $)<mi\; id="EditorElement\_510778">(</mi><mn\; id="EditorElement\_510770">1</mn><mn\; id="EditorElement\_510771">0</mn>$;

all of the above