Let $X = \{1, 2, 3, 4, 5\}$. The number of different ordered pairs $(Y, Z)$ that can be formed such that $Y \subseteq X, Z \subseteq X$ and $Y \cap Z$ is empty, is

Question

( A ) $5^2$
( B ) $2^5$
( C ) $5^3$
( D ) $3^5$