Which of the following describe features of a Section $403($b$)$ plan $($TSA$)?$

$1.$A catch$-$up contribution provision may apply for certain participants.

$2.$In general, the nondiscrimination rules in favor of highly compensated employees also apply.

$3.$The investment risk is borne by plan participants.

$4.$Loans are not allowed.

A$.3$ &$4$

B$.1$&$2$

C$.1,2,$&$3$

D$.2$&$3$