The message "Packet is a unit of data sent across the network" is to be sent over a reliable connection from node 0 to node 1. Here is a diagram of the first packet being sent: 0 0 DAT 12116 Packet is ACK 000 1 1 a. [1] Presuming that each packet can carry 10 characters of data, how many packets of DAT and ACK are required? b. [4] Presuming that the data header of each packet and the ACK packet is of the same size as in the diagram above (11 characters and 9 characters respectively), what is the ratio of "useful data" to the total data transmitted over the network for the given message? What is the "overhead"?