The Wainwright building was designed by _______(1)_______. It is one of the earliest examples of a _______(2)_______.
a. (1) Frank Lloyd Wright; (2) ferroconcrete construction
b. (1) Joern Uton; (2) cantilever architecture
c. (1) Louis Sullivan; (2) steel-framed skyscraper
d. (1) Joseph B. Straus; (2) skyscraper