So I've only ever had a Chicco infant seat, and Graco convertibles. I need help

My mom ordered my sister's twins the Graco SnugLock SnugRide 35 LX with TrueShield Technology. I assume they need the SnugRide SnugLock LX base, but I honestly can't find anything to confirm that because all the 3 base options say they work with all click connect seats.

Anyone know for sure?

Link to seat: