How can I tell if a Wi-Fi hotspot is WPA or WPA2?
You can find this out by holding Option and clicking on the WiFi icon in the Menu bar.

It will open up a "menu" with additional options and details including the type of security you're using.



If you see your network say WPA/WPA2 Personal, it means it supports both. This is what the Access Point supports.  In my case, I disabled WPA (and thusly it doesn't show up).  You can choose either QR code and the client will be connected.