An entrepreneur has developed a self$-$service soda$-$bottling machine. Customers can fill their own plastic soda bottles with $18$ regular and diet flavors by placing empty bottles under a nozzle, depositing coin and punching a series of buttons. The machine dispenses the requested soda and a bar$-$coded dietary information sticker, which the customer places on the bottle. The entrepreneur must now determine where to locate the machines by studying the market and then grouping outlets on the basis of her research findings. This is an example of the $\_\_\_\_\_$ segmentation approach.

Group of answer choices

psychographic segmentation

a priori segmentation

mass market segmentation

post hoc segmentation