5. In the following figure, four PCs (with indices 1, 2, 3, and 4) are connected through two bus- topology local area networks (LANs). The address configuration is also shown in the figure, where an upper-case letter means an IP address and a number means a physical address. Any data frame in the network has the following format: Layer 2 Layer 3 Layer4 header header header Layer 4 data Layer 2 trailer Assume a process with port address 'a' on PC 1 sends a message to a process with port address 'b' on PC 3. In the following table, please indicate the source & destination addresses used in the header of Layers 2, 3, and 4, for the data frame from PC 1 to the router and the data frame from the router to PC 3. (6 points) A/55 E/66 PC 3 PC 1 Router D/44 F/33 B/22 PC 2 PC 4 Data frame from PC 1 to the router Source address Destination addressSource address Destination address Data frame from the router to PC3 Laver 2 header Layer 3 header Layer 4 header