Refer to the exhibits.

FortiOS ADVPN 2.0 incorporates edge discovery and path management to establish dynamic spoke-to-spoke shortcuts while considering network transport compatibility and SD-WAN performance information.

Option C is the best-supported answer, provided the corresponding Branch-B interface TA belongs to transport group 1 and is enabled for compatible ADVPN shortcut establishment.

The visible Branch-A configuration establishes that T1 belongs to the overlay SD-WAN zone and uses transport-group 1 . The overlay zone also has advpn-select enable , allowing FortiOS to perform ADVPN-aware path selection.

The transport-group parameter identifies interconnected WAN transport networks. FortiOS exchanges transport-group information during ADVPN edge discovery and uses it to avoid establishing shortcuts across incompatible underlay networks.

Option A is incorrect because membership in an overlay zone does not make every interface pairing eligible for ADVPN shortcuts.

Option B is not supported by the transport and overlay conditions shown. Option D is incorrect because zone membership alone does not establish underlay compatibility or satisfy shortcut-selection requirements.

The defining principle is that ADVPN shortcut candidates must use compatible transport groups, with link health and path-selection criteria governing the final choice.

The video does not expose Branch-B ' s configuration, so option C remains a technically supported determination rather than a fully exhibit-verified result.