Which three statements are true regarding controllers? $($Choose three.$)$

Cisco APIC and Cisco UCS Manager are examples of API$-$driven Cisco controllers.

Each device with an API also has a built$-$in API controller.

A controller is the only way of interacting between the administrator and device.

Controllers use northbound and southbound APIs for communication.

Cisco Nexus is an example of a controller.

A controller must always be a hardware appliance.

Controllers provide a centralized administration and management point for many devices.

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