According to Section $7($a$)$ of the National Industrial Recovery Act $($NIRA$),$ which of the following are essential for industry codes of fair competition? $($Check all that apply.$)$

Multiple select question.

Workers shall be allowed to decertify independent unions that serve as their bargaining agents.

Workers should have the right to organize and bargain collectively through representatives they select.

Workers should not be dismissed on the basis of the employment$-$at$-$will doctrine that allows employers to fire workers for good cause or no cause.

Workers shall be free from the intrusion, control, and coercion of the employers in unionizing activities for the purpose of collective bargaining.