问题

Which of these statements is correct r

Which of these statements is correct regarding SSO and Cisco NSF?（）

A Utilizing Cisco NSF in Layer 2 environments can reduce outages to one to three seconds.
B Utilizing SSO in Layer 3 environments can reduce outages to one to three seconds.
C Distribution switches are single points of failure causing outages for the end devices.
D Utilizing Cisco NSF and SSO in a Layer 2 environment can reduce outages to less than one second.
E NSF and SSO with redundant supervisors have the most impact on outages at the access layer.

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