The Nurse Clarifies That Endocrine Glands,as Opposed to Exocrine Glands

The nurse clarifies that endocrine glands,as opposed to exocrine glands:

A) can put their secretions directly into the bloodstream.
B) must use a duct to put their secretions into the bloodstream.
C) must hold their secretions in a reservoir until they are needed by the body.
D) can produce constantly for body needs.