[单选] 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.

关于流感病毒血凝素，描述错误的是（）与细胞表面的N-乙酰神经氨酸（即唾液酸）糖蛋白受体结合。与病毒释放有关。是主要表面抗原，诱导机体产生中和抗体。容易发生变异，导致抗原性改变。地貌简述教育社会学的发展的新趋势。（）是解决党内矛盾的一大法宝。理论联系实际。密切联系群众。批评与自我批评。一切从实际出发。 What are two characteristics of OER？（） It can take on HSRP， VRRP， and GLBP as clients.。 It provides automatic inbound route optimization.。 Path selection may be based on delay， loss， or jitter.。 The border router makes decisions about which outbound path to use.。 Automatic load distribution is provided for multiple connections.。 Which of these statements is correct regarding SSO and Cisco NSF?（）

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

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