Which of the following features is found in the Basilica Ulpia in the Forum of Trajan?

The Basilica Ulpia, an important structure within the Forum of Trajan, is characterized by its central nave, which is a key feature commonly found in Roman basilicas. The central nave is the main space of the building, typically flanked by two side aisles, and serves as the focal point for both religious and civic functions. This architectural design allowed for large crowds to gather, facilitating various activities including legal proceedings, commercial transactions, and public gatherings.

The concept of a central nave is derived from earlier Roman and Greek architectural elements but is distinctly expressed in the design of Roman basilicas. In the case of the Basilica Ulpia, the grand scale of the central nave, coupled with its extensive use of columns and arches, reflects the architectural advancements during the time of Trajan and marks a significant development in Roman architecture.

Other features mentioned, such as a hypocaust system, would be more commonly associated with baths rather than basilicas, while an oculus is a feature more characteristic of domes (like the Pantheon) and not typical of basilica design. Pendentives are architectural elements used in the transition from a square space to a dome, which does not relate to the function or structure of the Basilica Ulpia. By focusing on the