A station transmits two special bit patterns - a preamble and a start frame delimiter (SFD) - prior to sending an Ethernet frame. Preamble SFD Ethernet frame 7 1 (10Mbps) The SFD byte that follows the preamble announces that the frame follows immediately. It consists of the pattern 10101011 A. Represent this pattern using Manchester encoding. B. Why is Manchester encoding not adopted in higher speed LANs, such as 100BaseTX LANs? C. In 100 Mbps LANs, an idle frame is constantly being transmitted. So, in addition to the preamble, there is a byte called start of stream delimiter (SSD) that is transmitted before the preamble. SSD Preambl SFD Ethernet frame 7 1 (100Mbps) Using NRZI encoding, represent the following 4B/5B control code used to indicate the start-of-stream (SSD) delimiter. 11000 10001