Which of the following describes architectural forms and features introduced by the Toltec?

Which of the following describes architectural forms and features introduced by the Toltec? (can be multiple answers)

1. elaborately carved friezes
2. the extensive use of columns as roof supports
3. painted polychrome designs on both interior and exterior surfaces
4. the use of architecture as a visible statement of cosmological beliefs and legends, and of political power
5. the placing of buildings around large open plazas
6. the Tzompantli (skull rack).
7. the occasional enlargement of buildings by erecting new structures on top of the old
8. the construction of solid, multi-tiered platforms as bases for temples and other structures
9. new building types comprising colonnaded halls and closed-end ballcourts in the shape of a capital letter I