Consider an instance of the relation Foo. Below, we ask you to write three create table statements. Each create table statement must define a primary key. Foo (A, B, C, D) A B C D 1 Ann 23 3 2 Bob 23 4 3 Joe 20 3 4 Bob 20 4 (a) Write two different create table statements for which the instance of Foo is legal. Note that taking the first statement and simply reordering columns does not give a different create table statement.