Answer:
3. ISDN
Explanation:
ISDN ( Integrated Services Digital Network ) -
It is the used for the simultaneous digital transmission of network service , data , video and voice , instead of the old circuits of the public switched telephone network ( PSTN ) , is referred to as ISDN .
The characteristic feature of ISDN is that it integrates the data and speech on the same lines , which is not possible in PSTN .
Hence, from the given information of the question,
The correct option is ISDN .
The connector for ethernet cables is called RJ45. for phone jack is RJ11. Although they look the same, the RJ11 has only 4 leads, as opposed to 9 leads in RJ45. Also, RJ11 is not as wide as RJ45, so the connector does not fit.
Even if it would, the signals would be totally incompatible, so no success can be expected.
