Consider the performance data about the four sales regions shown below. Which of the four regions has the highest performance index? 
Definitions:
Total Risk
The total variability in returns of an investment, encompassing both unsystematic and systematic risk factors.
Systematic Risk
The risk inherent to the entire market or market segment, also known as non-diversifiable risk, affecting all investments to some degree.
Beta Coefficient
A parameter for assessing the fickleness, or inherent market risk, of a security or a composite of investments compared to the overall market.
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