21. Answer the following: (a) How many nibbles are 16 bits? (b) How many bytes are 32 bits? (c) If a word is defined as 16 bits, how many words is a 64-bit data item? (d) What is the exact value (in decimal) of 1 meg? (e) How many K is 1 meg? ( What is the exact value (in decimal) of 1 giga? (g) How many K is 1 giga? (h) How many meg is 1 giga? G) If a given computer has a total of 8 megabytes of memory, how many bytes (in decimal) is this? How many kilobytes is this