You are given the graph of a function f. Determine the intervals where the graph of f is concave upward and where it is concave downward.Find all inflection points of f. 
Definitions:
Date Of Birth
The specific day on which an individual was born, often used as essential identification information.
Yield Ratio
The percentage of applicants from a recruitment source that make it to the next stage of the selection process.
Selection Ratio
The number of applicants compared to the number of people to be hired
Discrimination Lawsuits
Legal actions taken by employees against employers or other parties, alleging unfair treatment or bias based on protected characteristics such as race, gender, age, or disability.
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