Cell phones are seen by consumers to differ in quality, style, suitability, and lifestyle compatibility. Comparisons between these products are often quite difficult because they may have unique features and different levels of quality and price. What would cell phones be classified as$?$

Question $18$ options:

a$)$

product goods

b$)$

convenience goods

c$)$

homogeneous shopping products

d$)$

heterogeneous shopping products