Why did Justinian claim poetically that Hagia Sophia’s gigantic dome seemed to hang suspended on a "golden chain from heaven"?
a. The dome rests on a drum, and the coffering makes it appear weightless.
b. The dome is constructed of stone squinches around the base.
c. The dome rests on pendentives and piers, leaving the area below open.
d. The dome is supported from above rather than below.