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The correct answer is A.

OBJ-3.3: High availability (HA) is a component of a technology system that eliminates single points of failure to ensure continuous operations or uptime for an extended period. If a network switch or router stops operating correctly (meaning that a network fault occurs), communication through the network could be disrupted, resulting in a network becoming unavailable to its users. Therefore, network availability, called uptime, is a major design consideration for high availability networks.

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