Which of the following are examples of the diffusion of islam?

i. muslim merchants spread islam to african traders on the trans-saharan route.
ii. medieval spanish architecture incorporates islamic art.
iii. ottoman turks converted the hagia sophia into a mosque.
iv. muslim artists do not include human figures in their religious art.

answer choices:
1. i only
2. iii and iv
3. i, ii and iii
4. i, iii and iv
5. ii, iii, and iv