Which of the following situations would be true if you tried to upload a feed in Google Merchant Center that did not have availability for each product?

Google’s system will disapprove the feed until all required attributes are included. Availability is a required attribute.
Google’s system will flag it as a warning for you to resolve in the future. Availability is an optional attribute.
Google’s system will disapprove the feed, since availability is not an attribute in the product feed.
Google’s system will flag it with a warning for you to resolve in the future. Availability is a required attribute.