A rectangular pool measures 20 \mathrm{~m} by 8 \mathrm{~m}. There is a 1 \mathrm{~m} wide walkway around the outside of the pool, as shown by the shaded region. The area of the walkway is
Answer Choices
A. 56 \mathrm{~m}^{2}
B. 60 \mathrm{~m}^{2}
C. 29 \mathrm{~m}^{2}
D. 52 \mathrm{~m}^{2}
E. 50 \mathrm{~m}^{2}