3.1-1 Location of transport-layer functionality. Where is transport-layer functionality primarily implemented? Select one: a. Transport layer functions are implemented primarily at each end of a physical link connecting one host/router/switch to another one host/router/switch. b. Transport layer functions are implemented primarily at the routers and switches in the network. c. Transport layer functions are implemented primarily at the hosts at the edge of the network. 3.4-11 Packet buffering in Go-Back-N. What are some reasons for discarding received-but-out-of-sequence packets at the receiver in GBN? Indicate one or more of the following statements that are correct Select one or more: a. If some packets are in error, then its likely that other packets are in error as well b. The implementation at the receiver is simpler, c. Discarding an out of sequence packet will really force the sender to retransmit. d. The sender will resend that packet in any case