What is the difference between Standard and Specific Sign On methods?

What is the difference between Standard and Specific Sign On methods?

A.
Standard Sign On allows the user to be automatically authorized for all services that the rule allows, but re-authenticate for each host to which he is trying to connect. Specific Sign On requires that the user re-authenticate for each service.

B.
Standard Sign On requires the user to re-authenticate for each service and each host to which he is trying to connect. Specific Sign On allows the user to sign on only to a specific IP address.

C.
Standard Sign On allows the user to be automatically authorized for all services that the rule allows. Specific Sign On requires that the user re-authenticate for each service and each host to which he is trying to connect.

D.
Standard Sign On allows the user to be automatically authorized for all services that the rule allows. Specific Sign On requires that the user re-authenticate for each service specifically defined in the window Specific Action Properties.