Which of the following are not correct about Integrated Services Digital Network?

(i) It is a type of circuit-switched telephone network system.

(ii) It allows digital transmission of voice and data.

(iii) It cannot transmit voice and data over ordinary telephone copper wires.

(iv) Video conferencing is not possible through ISDN.

1
(i) and (ii)
2
(i) and (iii)
3
(iii) and (iv)
4
(ii) and (iii)
5
Question Not Attempted

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