(2pt) In the packet network shown below, the link speed is 1.0 Mbps and packet size is limited to 1K bits long. Consider a file that is 1M bits long. Packet Source (a) When the first r acket is being sent from the first switch to the second switch, Packet sw tchPacket switch Destination the second pacl et is being sent from the source host to the first switch. At what time will he second packet be fully received at the first switch? (b)How long does it take to move the entire file from source to destination