The PCI DSS applies to:

The correct answer highlights the broad applicability of the PCI DSS. The PCI Data Security Standard (PCI DSS) is designed to ensure that all entities that handle payment card information maintain a secure environment. This includes any organization, irrespective of its size or the nature of its business, that stores, processes, or transmits payment card account data.

By encompassing all entities, the standard aims to protect cardholder data and minimize the risk of data breaches across various types of businesses, whether they operate online, in physical stores, or through other transaction methods. This comprehensive approach underscores the importance of securing payment card information in any capacity, recognizing that vulnerabilities can exist in various formats and transactions.

The other choices limit the scope of the PCI DSS to specific business models or transaction volumes, which does not align with the intent of the standard. The PCI DSS is designed for all entities interacting with card data, reinforcing security measures universally across the payment ecosystem.