If A={x}A = \{x\}A={x} and B={y,z}B = \{y, z\}B={y,z}, which of the following is NOT a subset of A∪BA \cup BA∪B?
{x,y}\{x, y\}{x,y}
{z}\{z\}{z}
{x,y,z}\{x, y, z\}{x,y,z}
{x,w}\{x, w\}{x,w}