Match the following:

i. PSTN                              a. Virtual Switching

ii. X.25                               b. Message 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
d              c              a             b
3
c              d             a              b
4
b             c              d             a
5
c              a              d             b

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