What set of standards allows users to specify security functional and assurance requirements in systems?

The set of standards that allows users to specify security functional and assurance requirements in systems is known as Common Criteria. This framework is widely recognized for evaluating and certifying information security products and systems. It provides a comprehensive and consistent means to specify security requirements, ensuring that products meet specific security standards and can be trusted to protect sensitive information.

Common Criteria enables organizations to define their security needs through Protection Profiles and Security Targets, which detail the security requirements that a system must fulfill. This standardization fosters trust among users and developers, as it ensures that evaluated products provide consistent security assurances.

The other choices do not address the specification of security requirements in systems in the same structured and standardized manner. For instance, the Cloud Security Alliance's Security Trust Assurance and Risk primarily focuses on security assurance in cloud computing environments rather than setting functional and assurance requirements universally applicable to all systems. The Payment Card Industry Data Security Standard is specifically tailored to the protection of cardholder data and doesn't encompass broader functional and assurance requirements. The Economic Espionage Act is a law aimed at preventing the theft of trade secrets, thus not a framework for specifying security requirements.

In summary, Common Criteria's established framework for evaluating security ensures comprehensive coverage of functional and assurance aspects for systems, making it a