BSNL, Reliance, Shaw cable, AOL, Tata Indicom all can be kept in which one of the following groups?

BSNL, Reliance, Shaw cable, AOL, Tata Indicom all can be kept in which one of the following groups?
[A]ISDN
[B]IRC
[C]ISP
[D]Icons

ISP all are internet service providers

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