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 flat universe? 
Definitions:
Ethics Audit
A systematic evaluation of an organization's ethics programs and practices, aiming to identify potential areas for improvement and ensure compliance with ethical standards.
Credibility
The quality of being trusted and believed in, often influenced by a person's or organization’s reputation and their ability to provide reliable and accurate information.
Objectivity
The state or quality of being true even outside of a subject's individual biases, interpretations, feelings, and imaginings.
Retaliation
The action of returning a military attack; counterattack or the act of seeking revenge upon another.
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