6. Consider the network consist of 6 nodes A, B, C, D, E F. Assume this network uses CSMA/CD and signal travels with a speed of 3 x 10^8 km/sec. Distance between each node are as follows: dAB=24 km, dDB=20 km, dcp=78 km, dE=79 km, dDF=35 km, dcE-45 km, dEF-49 km. If sender sends at 15 Mbps, what could be the minimum size of the packet? (Note: each node can communicate to their directly connected nodes only) (6 M) A B D E F