Which best describes the role of Constantinople in the Byzantine Empire?

Constantinople served as the capital of the Byzantine Empire and was a vital cultural, political, and economic hub. Its strategic location between Europe and Asia facilitated trade and military defense, making it a center of power and wealth. The city was also a focal point for the spread of Orthodox Christianity and served as a symbol of Byzantine authority and heritage. Additionally, its impressive architecture, including the Hagia Sophia, exemplified the empire's artistic and engineering achievements.