[A] (3 points) Consider the Cyclic Redundancy Check (CRC) error-detecting scheme. Given a message D=11010110101011 and Pattern P = 11011, find the FCS and generate the sequence of bits to be transmitted. [B] (3 points) Assume that User 1 and User 2 are communicating using a reliable connection- oriented) protocol. Suppose that User 2 received the bytes from byte #0 to byte #96 from User 1. After that User 1 sent three more Frames to User2 right after each other. Frame # 1 contains 40 bytes of data, Frame #2 contains 20 bytes of data, and Frame # 3 contains 18 bytes of data. For Frame #1, the source port number was 101, and the destination port number was 41. Upon receiving a frame. User 2 sends an acknowledgment to User 1 confirming the recipient of the frame. If each frame is labeled by the sequence number of the first byte in the frame along with the total number of bytes it contains, answer the following questions: 1. If all frames arrive in order, what are the sequence number, source port number, and destination port number for the second frame received by User 2 from User 1? 2. If the second frame sent by User 1 was lost, what are the sequence number, source port number, and destination port number of the second frame received by User 2 from User 1? 3. If the third frame arrives before the second frame, in the acknowledgment of the first arriving frame from User 2 to User 1, what is the ACK number