In a company, different departments actively access various cloud$-$based applications and services to perform their tasks efficiently. The company's security team has concerns about the growing complexity and risks of managing user credentials across multiple platforms. To address this concern proactively, the team implements a modern authentication solution that actively provides Single Sign$-$On $($SSO$)$ capabilities, ensuring enhanced user convenience and security. In this scenario, which technology should the organization proactively employ for federation and enabling SSO capabilities effectively across the diverse range of cloud$-$based applications?

A$.$PKI

B$.$RBAC

C$.$LDAP

D$.$OAuth