Answer
$D\cap \emptyset=\emptyset$
Work Step by Step
$\bf{\text{Solution Outline:}}$
To get the elements of $
D\cap \emptyset
,$ get all the common elements of $D$ and $\emptyset$.
$\bf{\text{Solution Details:}}$
There are no common elements between $D$ and the empty set, $\emptyset.$ Hence,
\begin{array}{l}\require{cancel}
D\cap \emptyset=\emptyset
.\end{array}
