Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to leave a review on amazon [title] Be sure to test the product thoroughly before writing your review. [substeps] Per amazon's tos, you should have the product at least 48 hours before writing a review. For supplements or similar products, you should wait until they've had long enough to take effect before reviewing.

Ending1: [title] Determine the easiest way to submit a review. [step] Look at reviews of similar products and have an idea of which one is easier to review. Ending2: If you still have no luck considering the product before making the review, call amazon's customer service line at 1-800-2836 or email them at ebs.com. [title] Examine the product's estimated cost, marketing, and overall service. Ending3: For essential products, you should wait another 24 hours. The final steps should be listed in " a review guide. Ending4: [title] Don't intend to review broken or defective products. [step] Instead, try to get a replacement before writing a review.

Answer format: ending1/ending2/ending3/ending4