Under Rule 10b-5,which Is True About Insiders

Under Rule 10b-5,which is true about insiders?

A) Officers and directors are insiders,but employees who are not officers are not insiders.
B) Officers and directors are insiders,but lawyers or accountants that are hired only on a temporary basis are not insiders.
C) Employees at all levels in a company are insiders,as well as lawyers,accountants,and consultants even when hired only on a temporary basis.
D) Agents hired on a temporary nonemployee basis to provide services to the company are not insiders.