$($a$)$ Represent the common form of each argument using letters to stand for component sentences.

Original Argument

Common Form

If all computer programs contain errors, then this program contains an error.

This program does not contain an error.

Therefore, it is not the case that all computer programs contain errors.

$-$Select$--$

$($b$)$ Fill in the blanks so that the argument in part $($b$)$ has the same logical form as the argument in part $($a$).$

If then

$2$ is not odd.

Therefore, it is not the case that all prime numbers are odd,