The figure below shows scale factor RU as a function of time over the age of the universe.Ignoring the presence of dark energy,which curve would represent a plausible open universe? 
Definitions:
Quick Analysis Button
A feature in some software applications that provides fast access to tools for data analysis and visualization.
Chart Options Button
A feature in charting software that provides the user with various options to customize the appearance or behavior of a chart.
Format Axis Pane
A feature in charting software where users can adjust the appearance and scaling of a chart's axes.
Chart Sheet
A type of worksheet in Excel dedicated to displaying a chart or graph.
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