You have used DEBUG to unassemble the following instructions.

$-$U $01000108$

$1369$:$0100$ B$84365$ MOV AX$,6543$

$1369$:$0103$ BB$3394$ MOV BX$,9433$

$1369$:$0106$ F$7$E$3$ DEC BX

$1369$:$0108$ CD$21$ INT $21$

The instruction MOV AX$,6543$ is $\_\_\_\_\_\_\_\_\_\_\_\_$ bytes long.

$3$

$2$

$1$

$0$