In: Finance
Which of the following investments provides the least variability and risk?
| a. | 
 Investment B: Avg. return = 12%, std. deviation = 5%  | 
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| b. | 
 Investment D: Avg. return = 12%, std. deviation = 8%  | 
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| c. | 
 Investment A: Avg. return = 25%, std. deviation = 18%  | 
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| d. | 
 Investment C: Avg. return = 8%, std. deviation = 2%  |