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