C. Segmentation BEST meets both requirements.
Segmentation is a method of dividing a network into smaller parts to improve performance and security. By segmenting the network, the company can isolate different parts of the network from each other, which can prevent unauthorized access and improve performance.
While the other options (A. High availability, B. Application security, and D. Integration and auditing) are also important considerations for network performance and security, they do not directly address the need to transition network services to the cloud while maintaining performance and security.