What Is Meant by "Administrative Discretion

What is meant by "administrative discretion"?

A) The federal courts have considerable oversight ability and latitude to steer an agency.
B) An agency is not bound by its written regulations and may adapt its procedures to meet the particular circumstance.
C) Having enacted the legislation, Congress has reserved the right to create administrative guidelines for an agency.
D) When laws are vague, a federal agency usually has considerable freedom in deciding how to implement them.
E) In regard to a federal agency, the president has considerable freedom to dictate to the agency how a law will be implemented.