If $A=\{3,5,7,9,11\},B=\{7,9,11,13\},C=\{11,13,15\}$ and $D=\{15,17\}$.Find (x) $(A\cup D)\cap(B \cup C)$

Question

$\begin{array}{1 1}(A)\;\{3,5,7,9,11,15,17\}&(B)\;\{15,17\}\\(C)\;\{7,9,11,15\}&(D)\;\{11,15\}\end{array} $