$7$

$(19)$ The program will display periodically on the DATA field: $>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>$

$($a$)040608$

$($b$)02040608$

$($c$)0406080$ A

$($d$)$ NONE OF THE ABOVE

$($a$)00$ or $2$ A

$($b$)00$ or $3$ A

$($c$)20$ or $2$ B

$($d$)$ NONE OF THE ABOVE

$($a$)$ Executing an ARITHMETIC instruction

$($b$)$ Executing an ARITHMETIC or LOGIC instruction

$($c$)$ Executing an LOGIC or BRANCH instruction

$($d$)$ NONE OF THE ABOVE

$($a$)4$ times

$($b$)3$ times

$($c$)5$ times

$($d$)$ NONE OF THE ABOVE