Which version of the code is correct for showing Button component?

Question

Answer

<Button variant="outlined" sx={{ color="red"}}> Hello Marathon </Button>

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<Button variant="outlined" sx={ color:"red"}> Hello Marathon </Button>

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<Button variant="outlined" sx={ color:red}> Hello Marathon </Button>

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<Button variant="outlined" sx={{ color: red }}> Hello Marathon </Button>

Answer

<Button variant="outlined" sx={{ color:"red"}}> 
 Hello Marathon 
 </Button>

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