Match the following:

i. PSTN     a. Virtual Switching
ii. X.25        b. Packet switching
iii. Internet   c. Circuit Switching
iv. Frame Relay    d. Datagram Switching

 Match for  i , ii , iii, iv respectively is:

1
a , b , c ,  d
2
c ,  a , d , b
3
c , d  , a , b
4
b , c , d , a

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