Consider the Go-Back-N protocol with a sender window size of N = 4 and a sequence number range of 1024. Suppose that at time t the next in-order packet that the receiver is expecting has sequence number 228. Assume that the medium does not reorder messages. Which of the following is a possible pair of values for the senders send base (base window) and nextseqnum pointers at time r? O a. send base=224 nextseqnum=226 O b. send base=227; nextseqnum=232 O c. send base=228; nextseqnum=233 O d. send base=225; nextseqnum=228 O e. send base=229; nextsegnum=233