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4. For the following, assume that no data compression is done. Calculate the bandwidth necessary for transmitting in real time: (a) High-definition video at a resolution of 1920x1080, 24 bits/pixel, 30 frames/second. (b) POTS (plain old telephone service) voice audio of 8-bit samples at 8 KHz. (e) GSM mobile voice audio of 260-bit samples at 50 Hz. (d) HDCD high-definition audio of 24-bit samples at 88.2 kHz. 5. Show the 4B/5B encoding, and the resulting NRZI signal, for the following bit sequence: 1110 0101 0000 0011