PAN-OS software supports multiple authentication factors for Multi-Factor Authentication (MFA). These include Push, Voice, and SMS. Push notifications are a common factor where authentication requests are sent to a user's device and they can approve or deny the request. Voice authentication involves a call to the user’s registered phone number where they confirm their identity. SMS authentication involves sending a code to a user's mobile device which they need to enter to gain access. Factors like Okta Adaptive refer to a specific implementation but not a type of factor, and Pull is not a recognized authentication factor in the context of MFA supported by PAN-OS.