I voted, but my usual practice was not one of the options. I observe the visitor first. If the knocker has a FedEx, UPS or USPS uniform, I will open the door. If the person is holding a clipboard or carrying a plastic tub of sales items, I do not open the door or respond in any other way. After they leave, I check the porch to discard any ad materials that may remain.
On the rare occasion when I do open the door, I am covertly armed, because I always carry at home and anywhere else it is legal to do so.
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