Which of the following is a valid SQL FOR loop?

Question $6$ options:

$/*$ Pretend that total$\_$sal has been defined $*/$

FOR row $=$ SELECT salary FROM instructor

WHERE dept$\_$name $=$ 'Comp. Sci.$\text{'}$

BEGIN

SET total$\_$sal $=$ total$\_$sal $+$ row.budget

END

$/*$ Pretend that total$\_$sal has been defined $*/$

FOR row IN

SELECT salary FROM instructor

WHERE dept$\_$name $=$ 'Comp. Sci.$\text{'}$

BEGIN

SET total$\_$sal $=$ total$\_$sal $+$ row.budget

END

$/*$ Pretend that total$\_$sal has been defined $*/$

FOR

SELECT salary INTO row

FROM instructor

WHERE dept$\_$name $=$ 'Comp. Sci.$\text{'}$

DO

SET total$\_$sal $=$ total$\_$sal $+$ row.budget

END FOR

$/*$ Pretend that total$\_$sal has been defined $*/$

FOR row AS

SELECT salary FROM instructor

WHERE dept$\_$name $=$ 'Comp. Sci.$\text{'}$

DO

SET total$\_$sal $=$ total$\_$sal $+$ row.budget

END FOR

$/*$ Pretend that total$\_$sal has been defined $*/$

FOR $($INT row; row $!=$ END; row $++)$

SELECT salary FROM instructor

WHERE dept$\_$name $=$ 'Comp. Sci.$\text{'}$

$\{$

SET total$\_$sal $=$ total$\_$sal $+$ row.budget

$\}$