In the figure shown, the outer square has an area of 9\:cm^2, the inner square has an area of 1\:cm^2, and the four rectangles are identical. What is the perimeter of one of the four identical rectangles?
Answer Choices
A. 6\:cm
B. 8\:cm
C. 10\:cm
D. 9\:cm
E. 7\:cm