Write the Set as Indicated $\{ 2 \}$ Using Set-Builder Notation $\{ x \mid x$

Multiple Choice

Write the set as indicated.
-Write $\{ 2 \}$ using set-builder notation.

A) $\{ x \mid x$ is the natural number $2 \}$
B) $\{ x \mid x$ is all natural numbers $\}$
C) $\{ x$ is a constant $\}$
D) $\{ x \}$