Calculate the total time required to transmit a 1MB file over a single link in the following cases. Assume that the file is divided into segments of 900 Bytes each; the header to be added for each segment is 100 Bytes; Round Trip propagation time (RTT) is 80 ms per packet.

a. Bandwidth is 10 MBps, but an acknowledgement is needed before sending each subsequent packet [Ignore transmission time of acknowledgement packet].

b. Bandwidth is 10 MBps and data packets are sent without needing acknowledgement.