Which of the following descriptions of SIP registration is incorrect?

Which of the following descriptions of SIP registration is incorrect?
A . Users need to register with the server every time they turn on their computer.
B . When the SIP Client’s address changes, it needs to be re-registered.
C . Registration information must be refreshed regularly. Register usually saves the registration information to the Lation Server.
D . The function of SIP registration is to bind the AOR address to a Contact address so that the Proxy can find the calling address when making a call.

Answer: D