How Many Significant Figures Are Correct in Rounding 6.0221367?

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6.0221367 is a number rounded to 8 significant figures.

In a question, I am asked which of these shows correct rounding off.

6.022

6.0

6.02214

Aren't they all correct? It does not specify to how many figures.
 
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They all look correct to me.
 
I know.

And it is a question for an online tutorial. I don't know what to do.
 
Ideas?
 
Post the entire question maybe you left off a vital part
 

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