The OSI (Open Systems Interconnection) reference model has seven layers. Which of the following statements are correct in relation to the layers? i. the network layer handles routing ii. if a packet goes from one network to another, and the second network has a smaller maximum transfer unit limit, then the network layer will fragment the packet iii. the users are sitting at the presentation layer iv. the cables are associated with the physical layer i ii, iv i, ii, iii i, iv