Which of the following structures passes through the opening labeled 3 in the diagram? 
Definitions:
Normal Good
A type of good for which demand increases as the income of the consumer increases.
Normal Good
A good whose demand increases as consumers' income rises, holding all other factors constant.
Students' Incomes
The earnings received by students from part-time jobs, stipends, or scholarships, contributing to their financial support.
Demand
The amount of a product or service that buyers are ready and can afford to buy at different price points within a specified time frame.
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