What technology does a CAC resemble in terms of size and format?

The correct answer is a credit card because a Common Access Card (CAC) is designed to be the same size and shape as a standard credit card. This format makes it convenient for carrying and using in various identity verification systems and access control applications. The CAC typically includes embedded technology that allows for secure access to facilities and resources, much like how a credit card can contain security features and magnetic strips for transactions.

In contrast, while USB drives, mobile phones, and smartwatches serve their own unique purposes and functionalities, they do not share the same physical dimensions and practical usage for identity verification that closely aligns with a credit card’s format. A USB drive is often bulkier, mobile phones are significantly larger, and smartwatches, though compact, are designed for different types of interactions and wearable technology.