What do the two Frida's in the image above represent?​

What computer software program was used to create the design for the structure above? what is the main advantage to this program?

According to the hierarchy of chords, fill in the missing chord in this progression. i - iv - - i?

Forms of art depend upon a. the message the artist wants to convey and the culture. b. the artist’s tastes and the message the artist wants to convey. c. current trends and available materials. d. the money the artist can get from pieces sold.