(a) Explain briefly why a modern car uses several different bus standards for communication between its embedded devices. Identify the main bus standards, and explain the key differences between them (b) Two devices, A and B, attempt to transmit onto a CAN bus at the same time. How is this situation detected? What will determine which of the two devices successfully completes its transmission first? What loss of performance is associated with two devices transmitting at the same time? (c) A communication protocol uses 5 bit data words with 3 appended cyclic redundancy check (CRC) bits using the generator 1110. A data word of 10011 is to be transmitted. Calculate the required CRC. Show the full message that is transmitted Explain how the receiver makes use of the CRC, and what type of errors can be detected