Received my replacement , Spark Smart Modem - VRV9517UWAC34 this afternoon.

Just hooked it up and connected OK. but I noticed that only one wifi option is available. Went in to the setup and both the options, 2.4GHz and 5GHz are enabled.
In my old HG659b, both the 4.2G and 5G are visible and I could choose whichever I preferred to connect to.
Does it mean that I don't have the option to choose, and it's done automatically ?