If the Auto Attendant's answering is made up of the "Auto Attendant Greeting" (found under option 7 - System Greetings) AND the "Automated Attendant Prompt" (found in the usual place, option 3 - Auto Attendant), it's an R1.
Since there's no R2, the only other choice is R3, which doesn't have the Auto Attendant Greeting "feature"