血清型IgA占总Ig的（）

A.5％～10％

B.20％～25％

C.15％～20％

D.[0％～15％

E.1％～5％

NAC’s (Network Access Control) role is to restrict network access to only compliant endpoints and (81) users. However, NAC is not a complete LAN (82) solution; additional proactive and (83) security measures must be implemented. Nevis is the first and only comprehensive LAN security solution that combines deep security processing of every packet at 100Gbps, ensuring a high level of security plus application availability and performance. Nevis integrates NAC as the first line of LAN security (84) In addition to NAC, enterprises need to implement role-based network access control as well as critical proactive security measures-real-time, multilevel (85) inspection and microsecond threat containment.

A．constructive

B．reductive

C．reactive

D．productive