How many bytes will have been written to the standard output device after these instructions have been executed

Hello your question is incomplete below is the complete question

The following questions refer to this data segment (in x86 assembler language):

.data

var1 db 10h,20h

var2 dw 1020h

var3 db '4'

var4 db '56'

var5 db '789','$'

How many bytes will have been written to the standard output device after all these instructions have been executed?

mov dx, offset var3

mov ah, 9

int 21h

Answer : 4 bytes

Explanation:

(in x86 assembler language) The number of bytes that will have been written to the standard output device after the instructions listed have been executed is : 4 bytes

the omega button is one of them.