Fifteen years ago, everyone didn't have a cell phone. Anyone developing an app would not have found many users. Today, the existence of mobile apps is one of the reasons why smartphones are so popular today. These apps make phones and tablets smart, in terms of functionality and features. The app market is seeing hundreds of new applications introduced every day. This example shows that _______.
a. segmentation cannot identify a customer's wants and needs.
b. cell phone use has created a large enough market to make app development profitable.
c. segmentation avoids the need to design marketing mixes.
d. cell phone users are not a market segment.