AI-generated Key Takeaways
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          A carrier criterion is used for campaign targeting. 
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          It has fields like resource name, ID, name, and country code. 
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          Resource names are in the format carrierConstants/{criterion_id}.
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          ID, name, and country code are output only fields. 
A carrier criterion that can be used in campaign targeting.
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|---|---|
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 Output only. The resource name of the carrier criterion. Carrier criterion resource names have the form: 
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 Output only. The ID of the carrier criterion. | 
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 Output only. The full name of the carrier in English. | 
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 Output only. The country code of the country where the carrier is located, for example, "AR", "FR", etc. |