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. Discarding an out of sequence packet will really force the sender to retransmit. b. The sender will resend that packet in any case. c. If some packets are in error, then its likely that other packets are in error as well. d. The implementation at the receiver is simpler