Find the Total Length of the Red-Line Curve in the Figure

Multiple Choice

Find the total length of the red-line curve in the figure if the width of the maze formed by the curve is 48 inches and all halls in the maze have width 3 inches. $a = 3$ in. and $$b = 48$$ in.

A) 825 inches
B) 816 inches
C) 810 inches
D) 822 inches
E) 918 inches