Referring to the figure below, pick up the correct statement from the following.

• A. The total length of centre line of four walls is 20 m
• B. Length of long wall out-to-out is 6.80 m
• C. Length of short walls in-to-in is 3.20 m
• D. Total length of four wall – 20 m, length of short wall – 6.8 m