What is the significance of the control key? Note: There are 3 correct Answers to this question.

What is the significance of the control key? Note: There are 3 correct Answers to this question.
A . It is a value that can be used as a default value in the routing.
B. It is an optional field in the Work Center.
C. It is a value that can be copied to the routing as a reference.
D. It defines the usage of Work Centers in routings.
E. It is a mandatory field in the Work Center.

Answer: A,C,E