Which of the following is the structure designed to verify and authenticate the identity of individuals within the enterprise taking part in a data exchange?

PKI provides the trusted infrastructure for issuing and validating digital certificates that cryptographically bind public keys to verified identities through a chain of trust rooted in a certificate authority (CA). This enables parties in a data exchange to mutually authenticate each other, making PKI the structure specifically designed to verify and authenticate individual and system identities at enterprise scale.

SOA (Service-Oriented Architecture) is a software design pattern for building interoperable distributed services and has no role in identity verification or authentication.

Biometrics is a single authentication method using physical characteristics and is not an enterprise infrastructure for verifying and authenticating identities across data exchanges.

Single sign-on (SSO) is an access management feature that allows one login to access multiple systems, but it is not an identity verification infrastructure and does not authenticate parties in a data exchange.