Which of these recommendations is most appropriate for the core layer in the Cisco Campus Architecture？（）

• A、 Utilize Layer 3 switching
• B、 Utilize software accelerated services
• C、 Aggregate end users and support a feature-rich environment
• D、 Perform packet manipulation and filtering at the core layer
• E、 Use redundant point to-point Layer 2 interconnections when where is a link or node failure.