Which combination of username and password used by the peer router can enable PPP channel associated to complete authentication?

The configuration information of a router is as follows.

Which combination of username and password used by the peer router can enable PPP channel associated to complete authentication?
A . Username: test1 Password: test1
B . Username: test Password: test
C . Username: test2 Password: test
D . Username: test2 Password: test2

Answer: B