Place the following steps in the correct order for PPP callback, as specified in RFC 1570.
1. A PC user (client) connects to the Cisco access server.
2. The Cisco IOS Software validates callback rules for this user/line and disconnects the caller for callback.
3. PPP authentication is performed.
4. Callback process is negotiated in the PPP link control protocol (LCP) phase.
5. The Cisco Access Server dials the client.
A.
1, 2, 3, 4, 5
B.
1, 3, 2, 5, 4
C.
1, 4, 5, 3, 2
D.
5, 4, 3, 2, 1