The bottom portion of a skyscraper has 6 square segments, each created by 4 triangles. The top of the skyscraper made of 4 triangles forming a rectangle and positioned to the right of the bottom portion. The photograph above shows an example of .
a.
domino construction
c.
construction using ferroconcrete
b.
a steel frame skyscraper
d.
cantilever construction

Please select the best answer from the choices provided

A
B
C
D