Question

Two identical square pyramids were joined at their bases to form the composite figure below.
http://media.education2020.com/evresources/3107-12-05/mc008-1.jpg
Which expression represents the total surface area, in square centimeters, of the figure?
A: 8[1/2(24)(5)]
B: 8[1/2(24)(13)]
C: (24)(24)+8[1/2(24)(5)]
D: (24)(24)+8[1/2(24)(13)]