谵妄综合征的主要特征为

A．意识障碍昼轻夜重
B．幻觉
C．注意涣散
D．记忆减退
E．错觉

setting redundant components in subsystem to handle with the risks brought by the defaults of original components, what kind of risk response strategy is this （）。

A.risk avoidance

B.risk acceptance

C.risk mitigation

D.contingency plan