1.)what is true about how the how the between operator range is defined?
a.  > = and < =
b.  < and >
c.  < = and > =
d.  > and <
2.)why are alias' used for table and columns?
a.  to hide the column or table
b.  to give the appearance that they are new
c.  to be able to remove them from the database
d.  to make the names easier to understand