Question 5 A sparsely-populated database, like Google's Bigtable, will have which of the following characteristics? a. the database holds all data in a single table b. records do not have key fields c. tables will often have empty rows d. rows will often have unused columns e. most data is deleted shortly after being added Google often omits very common words (like "the") from its indexing process. Why? users rarely include them in search queries a. b. they don't affect relative page rankings much, if at all C. queries with or without them usually mean the same thing d. all of the above none of the above