List the Elements of the Set $\{ x \mid x$ Is an Even Integer } and B=

Multiple Choice

List the elements of the set.
-If A= $\{ x \mid x$ is an even integer } and B= $\{ x \mid x$ is an odd integer}, list the elements of $A \cup B$ .

A) $\{ x \mid x$ is an integer }
B) $\{ x \mid x$ is an odd integer}
C) $\phi$
D) $\{ x \mid x$ is an even integer}