An Organization Secures Its Network with Multi-Factor Authentication Using an Authenticator

An organization secures its network with multi-factor authentication using an authenticator app on employee smartphones. How is the application secured in the case of a user's smartphone being lost or stolen?

A) The application requires the user to enter a PIN before it provides the second factor
B) The application requires an administrator password to reactivate after a configured interval
C) The application verifies that the user is in a specific location before it provides the second factor
D) The application challenges a user by requiring an administrator password to reactivate when the smartphone is rebooted