An alien insurer is an insurance company organized or incorporated under the laws of a country other than the United States. The classification concerns the insurer ' s jurisdiction of incorporation, not whether the insurer is authorized to transact insurance within Arizona.

Insurance companies are commonly classified as domestic, foreign, or alien. From Arizona ' s perspective, a domestic insurer is organized under Arizona law. A foreign insurer is incorporated under the laws of another U.S. state or jurisdiction. An alien insurer, by contrast, is formed under the laws of another country. For example, an insurer incorporated in the United Kingdom and authorized to transact insurance in Arizona would still be classified as an alien insurer.

Operating without a Certificate of Authority describes an unauthorized or nonadmitted insurer; it does not define alien status. An alien insurer may obtain authorization and legally conduct insurance business in Arizona while retaining its alien classification.

Therefore, the decisive element is incorporation outside the United States, making A correct.

Study Guide Reference: Insurance Regulation — classifications of insurers; domestic, foreign, and alien insurers; authorized/admitted versus unauthorized insurers.