Many computers use one byte (8 bits) of data for each letter of the alphabet. There are 44 million words in the Encyclopedia Britannica. Assume the average word is five letters long and that a pin head is 1 square millimeter in area. (a) What is approximate bit density (in bits per square inch) of the head of a pin if the entire Encyclopedia Britannica is printed on it? Choose between the following answer choices: Roughly one terabit per square inch, Roughly one petabit per square inch, Roughly one exabit per square inch, Roughly one zettabit per square inch (b) What would be the distance (spacing) between each bit, in nanometers?