$15.($Yes$/$No$)$: Is it possible for both the Sign and Zero flags to be set at the same time?

Use the following variable definitions for Questions $16-19$:

$.$data

var$1$ SBYTE $-4,-2,3,1$

var$2$ WORD $1000$h$,2000$h$,3000$h$,4000$h

var$3$ SWORD $-16,-42$

var$4$ DWORD $1,2,3,4,5$

$16.$ For each of the following statements, state whether or not the instruction is valid:

a$.$ mov ax$,$ var$1$

b$.$ mov ax$,$ var$2$

c$.$ mov eax, var$3$

d$.$ mov var$2,$ var$3$

e$.$ movzx ax$,$ var$2$

f$.$ movzx var$2,$ a$1$

g$.$ mov ds$,$ ax

h$.$ mov ds$,1000$h

$17.$ What will be the hexadecimal value of the destination operand after each of the following

instructions execute in sequence?

mov al$,$ var$1$ ; a$.$

mov ah$,[$var$1+3]$ ; b$.$

$18.$ What will be the value of the destination operand after each of the following instructions execute

in sequence?

mov ax$,$ var$2$ ; a$.$

mov ax$,[$var$2+4]$ ; b$.$

mov ax$,$ var$3$ ; c$.$

mov ax$,[$var$3-2]$ ; d$.$

$19.$ What will be the value of the destination operand after each of the following instructions execute

in sequence?

mov edx, var$4$ ; a$.$

movzx edx, var$2$ ; b$.$

mov edx, $[$var$4+4]$ ; c$.$

movsx edx, var$1$ ; d$.$