Contoso Bikes have forgotten to update, or re-upload, their product feed file. After how long will their feed file expire if it's not updated or re-uploaded?

The selected answer option, 30 Days, is correct because in systems like Microsoft Merchant Center or Google Merchant Center, the product feed file typically expires after 30 days if it is not updated or re-uploaded. This expiration period ensures that the product data remains current and reflects the most accurate information, such as pricing, availability, and other product details. If the feed is not refreshed within 30 days, the ads associated with the outdated product information may no longer run correctly, leading to potential errors or disruptions in the campaign. Therefore, it is crucial for businesses like Contoso Bikes to regularly update their product feed to avoid any issues with ad visibility and accuracy.