Identify the Choice That Best Completes the Statement or Answers

Identify the choice that best completes the statement or answers the question.
-Use of the EIN on a standard transaction is required

A) to verify an employee's participation in the group health plan.
B) when the sponsor of health plan is a self-insured employer.
C) to identify when an employee is enrolled or disenrolled in a health plan.
D) to identify the employer of a person covered under a health plan, when the employer is not the sponsor.