Answer:A couple disadvantaged are the migraines that is can cause. And it can cause eye strain there are alot of things that could hurt your eyes. Like being in virtual reality for to long. It can very rarely make you go blind.
Explanation: sorry if its wrong
Answer:
are u sure this is the right question?
Explanation:
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 .
