Egyptian architects were quite innovative in solving problems. An invention that was seen in its primitive form in the valley temple of the Pyramid of Khafre, the clerestory, became a fully realized architectural element at Karnak. Which of the following describes the functional element?
a. raised central roof permitting light to filter into the interior
b. provided structural support to permit banks of windows on the side walls
c. permitted skylights to be inserted at each corner of the roof line
d. widened central aisle permitting larger entry adding more interior light