Consider 802.11 Medium Access Control (MAC) protocol using DFWMAC-DCF (Method 1). Assume there are 3 stations, STA-A, STA-B, and STA-C, with one frame arrival each, at time t = 20s, t = 30s, and t = 70s, respectively. Starting from time t = 0, one frame of 60s was in transmission. Assume that the backoff time (wrt slot time) for STA-A, kA = 10, kB = 8, and kC = 0, are chosen, respectively. Draw a time diagram from t = 0 to the end of all 3 frames that are transmitted successfully. Assume that all frames are 60s, and slot time is 10s, with DIFS=40s.