CUP connector configuration issue

It is mentioned in the Configuration guide that, the connector that is used for RAR (corresponds to a backend system) should be used for CUP aswell.

But, when i create a connector in webdynpro->content administration,

RAR is showing the connector name(s) in the following syntax (even though we create multiple connectors with different names under content administration for same backend system):

<message server name>_<system name>_<client number>

where as CUP is showing the connector name same as that of content administration.

now, my questions are

Q1) how to know which connector is being used by RAR out of multiple connectors defined under content administration, so that I can use the same for CUP also.

Q2) Do we need to select model connector or metadata connector for CUP?

Q3) Do we need to select VIRSAR3 connector or VIRSAXSR3 connector for CUP?