2FA Questions

For those of you who think you understand Ring’s 2FA implementation:

Overall:
● Is it possible to choose the method of your choice (among registered methods) each time you log in?

Authenticator Apps:
● Is it possible to register more than one authenticator app?
● Is it possible to modify the (adjustable) parameters of a registered authenticator app?
● Is it possible to delete a registered authenticator app?
● Is it possible to register multiple authenticator apps? If so, how many?

Cellphone Method:
● (Note: I would NOT recommend this method. Ever user is obviously free to make their own choice, however, based on their individual circumstances.)
● Can you add a cellphone number?
● Can you delete a cellphone number?
● Is it possible to register more than one cellphone? If so, how many?
● Has Ring (officially) promised that cellphone numbers used for 2FA purposes will remain encrypted and will not be used for any purpose whatsoever other than for 2FA?