Sedna has a ground which is an irregular quadrilateral as shown in the figure below. Which of the following equation below represents the perimeter of the quadrilateral ?

Question

$\begin{array}{1 1} (a)\;5m+1 \\ (b)\; 5m-1 \\ (c)\; 5m-2 \\ (d)\; 5m+2 \end{array}$