20. (Bonus 5 points) (Rosen 2.3.60) In asynchronous transfer mode (ATM) (a communications protocal used on backbone networks), data are organized into cells of 53 bytes. How many ATM cells can be transmited in 10 seconds over a link operating at the following rates? (Hint: See Example 28 in section 2.3 of the textbook.) (a) 128 kilobits per second (1 kilobit 1000 bits) (b) 300 kilobits per second (c) 1 megabit per second (1 megabit 1,000, 000 bits)