A security administrator needs a secure computing solution to use for all of the company's security audit log storage, and to act as a central server to execute security functions from. Which of the…

A standard RHEL implementation with only a software firewall lacks a formally enforced MAC policy framework and does not provide the high-assurance security required for audit log integrity.

Windows 7 is an end-of-life operating system with no active security support and lacks a built-in MAC enforcement framework comparable to SELinux trusted policies.

A permit-all firewall policy on a bastion host directly contradicts hardening principles and would expose the security server to all inbound traffic, undermining its purpose.

Solaris 10 Trusted Extensions and SELinux with a trusted policy both enforce mandatory access control (MAC), which provides kernel-level separation of security domains and prevents unauthorized access to audit logs even by privileged users. These platforms are specifically designed for environments requiring high assurance security, making them the strongest choice for a centralized security function server.