You are designing a strategy to ensure that DNS queries always take the most efficient route to get resolved. Which action or actions should you perform？（）
A. Configure conditional forwarding on the corporate DNS servers to point the development DNS servers.
B. Configure conditional forwarding on the development DNS servers to point the corporate DNS servers.
Configure conditional forwarding on the perimeter network DNS servers to point the corporate and development DNS servers.
D. Configure forwarding on the corporate and development DNS servers to point the perimeter network DNS servers.
E. Disable root hints on the perimeter network DNS Servers.
按《国家电网公司关于进一步提高工程建设安全质量和工艺水平的决定》规定，新设计建设的输变电工程建构筑物使用寿命达到（）年以上，变电主要一次设备和线路主要设备使用寿命达到（）年以上，主要二次设备使用寿命达到（）年以上。
A. 60；40；20
B. 50；30；30
C. 70；50；20
D. 70；40；30
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