What will happen if you try to upload a feed in Google Merchant Center that does not have availability for each product? 

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

Answer: Availability is a required attribute, so Google's system will disapprove the feed until all required attributes are included.