After you change it to suit your specific need, it will do what you asked for it to do with the understanding that it is not automatic based on simply checking the box. The user has to check the box and then exit that box.
If you read the code you will discover what changes you need to make to it.
To be honest, you have choose a rather poor design. Check boxes are not mutually exclusive so there is nothing to keep your users from checking all three.
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