Which of the following are possible options when working with SAP SuccessFactors Employee Central employee identifiers? Note: There are 3 correct answers to this question.

Which of the following are possible options when working with SAP SuccessFactors Employee Central employee identifiers? Note: There are 3 correct answers to this question.
A . Once generated, you CANNOT change a user id.
B . A user can have only one user id.
C . Once generated, you CANNOT change a person id external.
D . A user can have multiple user ids.
E . A user can have only one person id external.

Answer: A D E