What does KBA stand for in the context of identifying a signer's credibility?

In the context of identifying a signer's credibility, KBA refers to Knowledge-Based Authentication. This method involves verifying an individual's identity by asking questions that only the individual should know the answers to, based on personal information. This process can include questions about past addresses, financial transactions, or other personal data that is not readily available to the public. The aim is to ensure that the person signing is indeed who they claim to be, thereby enhancing the security and integrity of signatures in various contexts, such as electronic documents or financial transactions.

Other options present different concepts that do not relate directly to the process of verifying an individual's credibility. For example, Key Business Agreement pertains to formal pacts between businesses, Kinematic Behavior Analysis relates to the study of motion in dynamic systems, and Key-based Access generally refers to security methods using physical or digital keys. None of these correctly represent the process of authentication to validate a signer's identity.