The correct option is A y=√x
Given that
Domain:{4,25,36,49}
Range : {2,6,5,7}
On checking through options,
Option(a)–––––––––––:y=√x
Here, on putting values of domain and range in the function,
2=√4,5=√25,6=√36,7=√49
hence, y=√x satisfies given mapping.