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TCA9548A: Who gives the ACK signal when all channels are activated at the same time?

Part Number: TCA9548A

We are using 4 channels that are active at the same time.
Who sends the ack signal to the master at this time?

If you enable 4 channels and connect only 3 devices, the ack signal comes in as the master.

Does TCA9548a make ack signal?