To which switch or switches should you provide redundant links in order to achieve high availability with reliable fast convergence in the enterprise campus?（）

• A、to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 2 link
• B、to a core switch running Cisco NSF and SSO from redundant distribution switches connected with a Layer 3 link
• C、to two core switches from redundant distribution switches connected with a Layer 2 link
• D、to two core switches from redundant distribution switches connected with a Layer 3 link
• E、to two core switches running Cisco NSF and SSO from two redundant distribution switches running Cisco NSF and SSO