ex-8000 mesh extender

So, I am using the Netgear Nighthawk App I downloaded and I'm connecting to the EX8000 AC3000 Mesh WiFi Extender. One question has me Stumped. It asks if I want to select "WPA2-PSK" or "WPA-PSK/WPA-PSK" ... With no explanation Given. No Popups, or Anything I can Find. My Properties on my Computer Lists: that i am Using: "WPA2-Personal" and 'AES' both being Used. Neither of these Two are an Option on the Netgear App. I am 99.9999% Sure it's One of the two above options I have to Choose, but the Netgear App is of No help. Anyone can Shine light on this, for me? Explain which of the First two options, I must Select?  

Thanks in advance.