Which of the stars from the figure below would show variability in its brightness? 
Definitions:
Return
The income generated from an investment, expressed as a percentage of the original investment cost.
Discounted Payback
A payback period calculation that takes into account the time value of money by discounting each of the cash flows from the project at a particular rate before it sums them to determine the break-even point.
Payback Period
The time required for the return on an investment to "pay back" the sum of the original investment, commonly used as a measure of investment risk.
Profile
A description or analysis of the characteristics, qualities, or activities of a person, organization, or thing.
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