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