The answer is: D. identifying an audience for the product.
Cubing is methodology that use the following six perspectives of a topic:
1. Describing: Physical characteristics of the topic
2. Comparing: Similarities and differences of the topic against other
3. Associating: Find thing that this topic make you think of
4. Analyzing: Evaluate the components and their relation
5. Applying: Validate the uses or application of your topic
6. Arguing: Discuss the pros and cons of the topic
Each one of this part can be link to an option except the option D
A. describing physical attributes of the product. -> 1
B. relating your product to something else. -> 3
C. telling how your product can be used.-> 5
D. identifying an audience for the product. -> Is not a part