The image shows a close-up photograph of a structure, called a finial, atop the main dome of the Taj Mahal. The structure includes a lotus bud and a crescent moon with tips pointing heavenward. Use the photograph to answer the following question:
 Public Domain
 The crescent moon in the finial at the top of the Taj Mahal is evidence of what architectural influence?
 choices:
 Roman architecture
 Greek architecture
 Islamic architecture
 Early Christian architecture