Cai Guo-Qiang's work at an air show in San Diego where he directed planes to draw a Chinese landscape, which then floated away, illustrates

a. that Cai is not very creative
b. that realistic rendering is not the only form of drawing
c. that Cai cannot draw on his own
d. the lack of imagination in the question, "Can he draw?"
e. both b and d

e. both b and d