What are the rights of un-married girls to choose husband in Islam?

please provide the answer and if possible the reference

1 : what rights does a girl has to choose her husband by her self ??

2 : up to what limit and what right her parents have over her will ??

3 : is it ok for a girl to deny the choice chosen by her parents ??

4 : is it ok for the parents to deny the choice chosen by their daughter ??

I have also heard ,that a choice of a girl is superior to her parents , how right is this ??

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