__________ are important in compilers and operating systems—insertions and deletions are made only at one end of a __________—its top.

In a queue, items can be added ______.

a) only at the front of the queue b) only at the back of the queue c) either at the front or at the back of the queue d) at any position in the queue

In a SELECT statement, what follows the SELECT keyword?

a) the name of the table b) the name of the field(s) c) the name of the database d) the criteria that the row must meet