Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to store coffee beans or ground coffee [title] Store your coffee in an airtight container. [step] One of the biggest enemies of fresh-tasting coffee is oxygen. Exposure to the air causes coffee beans, and especially ground coffee, to go stale very quickly.

Ending1: Use your coffee immediately after it has been percolated and is stored in an airtight container. [substeps] Do not include coffee in your refrigerator, freezer, and storage container for at least 12 days before brewing. Ending2: The air filters, occasionally metal wheels, may also clump up and run as you shake your coffee beans/ground coffee, therefore resulting in bad tasting tasting and ugly coffee. [substeps] Even if this is the case, ideally that coffee package should contain double-layer jars as they will keep the coffee fresh without turning stale. Ending3: Coffee will expire within six to twelve months. Keep this in mind when setting up your coffee filter or compost bin. Ending4: Invest in an hermetically-sealed container made for storing coffee, or at least use a container with a heavy airtight lid. [substeps] Airtight containers are also ideal for preventing coffee from absorbing neighboring odors and discouraging insect and mold growth.

Answer format: ending1/ending2/ending3/ending4