Jawwal has designed a cell phone plan especially for tech$-$savy teens who are heavy cell$-$phone users and live at households earning over NIS $150,000$ per year. In tailoring the plan for a specific group of consumers based on their particular needs, Jawwal has provided an example of:O a$.$ broadcastingO b$.$ differentiationO c$.$ segmentation d$.$ market targetingO e$.$ positioning