In a sliding window error control system, Station A sends a packet with bytes 501-700, followed immediately by a packet with bytes 701-900. Create a diagram of this error control scenario and show the response(s) that Station B will send if the second packet is lost in the network. Note: The diagram should be similar to the following schematic: A: 501-700 , 701-900--> B B: ??? ---> A You need to figure out what ??? is.