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Which of the following is true about ISDN? It uses a modem to modulate / demodulate the signal. Its BRI format consists of two B

Which of the following is true about ISDN?
It uses a modem to modulate/demodulate the signal.
Its BRI format consists of two B-channels and one D-channel.
Its PRI format provides bandwidth up to 128 Kbps.
It uses a terminal adapter to connect to the network.

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