When did the osi reference model originate? a 1983 b 1970 c 1984 d 1979

The Open System Interconnection (OSI) model is a reference model - framework how  to implement protocols and how applications communicate over a network.The OSI model was developed by the International Standards Organization (ISO) and representatives of major computer and telecommunication companies beginning in 1983. Correct A

1. b

2. c

3. b

4. a

5. b

b and c ( ip address and port number)