Suppose a firm$$s cost function is given by C$($q$)=92$q $+$ q$2.$ Consider the following

statements:

$($I$)$ The fixed cost is $9$;

$($II$)$ The marginal cost is equal to the average variable cost;

$($III$)$ The cost is minimized at q$=1.$

Which of the statements above are true?

$($a$)$ All of them

$($b$)$ Only $($I$)$

$($c$)($I$)$ and $($II$)$

$($d$)($I$)$ and $($III$)$