Which of the Following Statements Is True About a Command

Which of the following statements is true about a command group?

A) A command group is an example of an informal group.
B) A command group is composed of employees who enjoy one another's company and socialize with one another.
C) A group of interns who work in a hospital and have lunch together twice a week constitute a command group.
D) A command group is composed of the CEO, the president, and the heads of the most important departments.
E) Subordinates who report to the same supervisor compose a command group.