Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to organize papers [title] Purchase stackable document trays. [step] Reserve the top tray for documents you need to read immediately. Label the second tray for documents that can wait a few days.

Ending1: Label the first tray with the date so you can easily find them later. [title] Reserve the other needed areas for documents you will need to retain. Ending2: This tray ensures you have everything you need. [substeps] On stackable document trays, use matching labels from the publication date on the bottom. Ending3: Reserve the third tray for documents you can file, and so on. Place them on your desk within easy reach. Ending4: [substeps] For academic papers, generally documents should be stored in the upper tray. Smaller and older papers will go in the upper tray.

Answer format: ending1/ending2/ending3/ending4