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

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.