If A={a,b,c}A = \{a, b, c\}A={a,b,c}, what is A∩AA \cap AA∩A?
{a,b,c}\{a, b, c\}{a,b,c}
∅\emptyset∅
{a,b,c,a,b,c}\{a, b, c, a, b, c\}{a,b,c,a,b,c}
{a,b,c,∅}\{a, b, c, \emptyset\}{a,b,c,∅}