Shopping ads on google.com:
don’t use keywords
indicate the name of the merchant
can be served together with text ads
all of the answers are correct
Instead of keywords, Shopping ads use the product attributes you defined in your Merchant Center data feed to show your ads on relevant searches. More than one of your Shopping ads can appear for a given user search and, if relevant, a Shopping ad and a text ad can also appear at the same time.
Read more here: https://support.google.com/merchants/answer/2454022