Let A={x:x2−3x+2=0}A = \{x : x^2 - 3x + 2 = 0\}A={x:x2−3x+2=0} and B={x:x2−4x+3=0}B = \{x : x^2 - 4x + 3 = 0\}B={x:x2−4x+3=0}. What is A∪BA \cup BA∪B?
{1,2,3}\{1, 2, 3\}{1,2,3}
{2,3}\{2, 3\}{2,3}
{1,2}\{1, 2\}{1,2}
{1}\{1\}{1}