Focus solely on identifying and mapping attack techniques to the MITRE ATT&CK matrices for each environment, as this provides a baseline for threat detection without the need for further action.

After mapping attack techniques, assess the current security controls' effectiveness but delay implementing any changes to avoid disrupting existing operations and incurring additional costs.

Develop a phased approach that starts with identifying attack techniques, assesses current controls, addresses gaps with scalable solutions, and includes a plan for continuous monitoring and updates, ensuring compliance and cost-effectiveness.

Implement all possible security tools and controls across all environments immediately to ensure no attack technique goes undetected, regardless of cost or operational impact.

All of the above.