What is the meaning of letter "R" on an active session in the menu PPP...

In the PPP > Active Connections window in RouterOS, the letter "R" in the "Flags" column indicates the session is Running. This means the session is active and fully negotiated.

A.✘Radius – Not what "R" stands for in this context

B.✔Running – The connection is established and currently operating

C.✘Remote – Not relevant in this context

Extract from MTCNA Course Material – PPP Interface Flags:

“R indicates a Running state. The session is successfully established and data can be transmitted.”

Extract from MikroTik Wiki – PPP Flags Reference:

“R = Running. The session is active.”