5. A file of size 2 GB (where 1 GB -10 bytes) is to be sent over a packet-switched network in which each packet carries a header of size 40 bytes and a maximum payload of 40,000 data bytes. The path from the source to the destination consists of 3 hops. Each link has a transmission rate of 1 Gbps and a propagation delay of 5 msec. You may ignore processing and queuing delays. a) Find the total end-to-end delay for sending one packet from the source to the destination. b) For the file of size 2 GB, how many packets are transmitted by the source? c) Find the total end-to-end delay for sending the entire file from the source to the destination. d) Is your answer for part (c) equal to the product of your answers for parts (a) and (b)? Explain why or why not