Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to navigate dog classified ads [title] Be on guard with free classifieds. [step] Before you start skimming through classified ads, check whether it's free to post listings or if a fee is charged to do so. Expect to find puppy mills, backyard breeders, and scammers advertising dogs on free sites.

Ending1: Remember: their chief concern is making money, so obviously they're going to spend as little as possible and certainly take advantage of free advertising. [substeps] This doesn't mean that sites that charge money to post listings are 100% free of untrustworthy sellers. Ending2: You should also be on the lookout for attention to detail that would indicate the dog has an official name. If the dog needs a name, be aware of this. Ending3: [substeps] Sign up for fliers and promotional materials, and put them on dog classified ads. Try turning some of your fliers into puppy ads. Ending4: Keep an eye out for reviews of the ads so you know what sort of ad they are looking for. [substeps] Don't be too petty about looking at subscription results and initial reviews.

Answer format: ending1/ending2/ending3/ending4