How to erase my data on my iphone without restoration?

I'm selling my iphone 3gs to my friend and she won't have a way to activate it, so i was wondering if it was possible to erase all the content and data for her without having to restore it, I've already backed up all my files and logged out of my apple id on it

If i remember correctly (since it is an older model) there's an option in the settings section to delete all data

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