Refer to the exhibit. Which two of these are correct regarding the recommended practice for distribution layer design？（）

• A、use a redundant link to the core
• B、use a Layer 2 link between distribution switches
• C、never use a redundant link to the core because of convergence issues
• D、use a Layer 3 link between distribution switches with route summarization
• E、use a Layer 3 link between distribution switches without route summarization