What type of file contains the issuer's record of all cardholder accounts?

A Cardholder Master File is the correct answer because it serves as the centralized database that contains detailed records of all cardholder accounts managed by an issuer. This file includes critical information such as cardholder names, account numbers, transaction history, and account statuses. It is essential for the issuer to effectively manage accounts, process transactions, and maintain accurate financial records.

In contrast, the other choices do not fulfill the same function. The Card Identification Number is primarily a unique identifier related to a specific card, rather than a comprehensive record of account information. A Cardholder Profile typically refers to a set of attributes or preferences associated with a particular cardholder but may not encompass the complete range of account details. Lastly, a Card Mailer is related to the physical mail or communication sent to cardholders, often containing card information and usage instructions, but it does not serve as an ongoing record of account activity.