If primary and secondary root switches with priority 16384 both experience catastrophic losses, which tertiary switch can take over?

Question:
If primary and secondary root switches with priority 16384 both experience catastrophic losses, which tertiary switch can take over?

• a switch with priority 20480
• a switch with priority 8192
• a switch with priority 4096
• a switch with priority 12288

Explanation: This is a tricky question. We know the switch with lowest value of priority is elected the root switch. Therefore in this question the switches with priority of 4096, 8192, 12288 (which are lower than the current value of the root bridge 16384) are not joining the root bridge election by somehow. The only suitable answer is the switch with priority 20480 will become the root bridge.

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