A TCP window holds bytes from 501 to 2000. The next byte to be sent is 1011. Describe the window for the current situation by Sf, Sn, and window size parameters. Describe the window by Sf, Sn, and window size parameters after an ACK segment with the acknowledgement number 700 and windows size advertisement of 2000 is received. Describe the window by Sf, Sn, and window size parameters after a segment carrying 600 bytes is sent. Assume all events 1, 2, and 3 happen in numerical order.