$4)$The instruction MOV DS$,0124$is not a valid instruction because:

$$a$.$The segement register is $16-$bits and the operand is larger than $16-$bit

$$b$.$To move information to the segment registers, the data must first be moved to a general$-$purpose register, then to the segment register

$$c$.$The operand should be bracketed

$$d$.$The operand must first be placed in the CS register before moving it to the DS register

$13)$In the Intel $8086/8088$ microprocessor, given the program

MOV AL$,01$FF

MOV BX$,$ AL

The result of the program will be stored:

a$.$In the BX register

b$.$In the AL register

c$.$In the DS register

d$.$None of the above

$24)$The SP register is decremented after the push is to make sure the stack is growing.

a$)$Upward to the maximum limits of the stack segment

b$)$Downward to the lowest limits of the stack segment

c$)$Downward from upper addresses to lower addresses

d$)$Downward in step with the instruction pointer registers