Explanation:

Answer: (a) Kilobyte (KB)
 A KB is the unit symbol for the 'Kilobyte'. In SI (International System of units), the prefix kilo in Kilobyte means 1000. So, one kilobyte is 1000 bytes. In Decimal (i.e., with base 10), 1 kilobyte is equal to 1000 bytes, and in binary (with base 2), 1 kilobyte is equivalent to 1024 bytes. A kilobyte is that unit, which is larger than a byte (B) and smaller than the unit megabyte (MB).