Final answer:
The purpose of the architectural features in Palazzo Rucellai was to provide structural support, enhance the decorative appearance, and showcase the architect's skills. Option 2 is correct.
Step-by-step explanation:
The purpose of the architectural features used in Palazzo Rucellai in Florence, Italy, served multiple functions. Firstly, the features were used to provide structural support to the building. Secondly, the features were incorporated to enhance the decorative appearance of the palace. Finally, the architectural features were designed to showcase the architect's skills and demonstrate the mastery of Renaissance architecture.