It takes 24 feet of fence to surround a square piece of land in Linda’s backyard. Linda wants to plant flowers everywhere but on the diagonal sidewalk. there is 1 foot of sidewalk along two sides of the square. What is the area of the sidewalk? (A) 5 ft2 (B) 5.5 ft2 (C) 6 ft2 (D) 6.5 ft2 (E) 7 ft2