[learntofly]

I think this relates to a time before 2 Factor Authentication, when Apple used 2 Step Verification. You could st that time (if you were using iOS 6 to iOS 8) chose various recovery options.

I'm no expert but this is my recollection.

In the scenario where you have 2 devices, one is iOS 9/10 and have migrated from 2SV to 2FA, the other is iOS 6/7/8, you can still access the recovery menus on the iOS 8 device, but it does weird things to the keychain if you mess about with it.