all of the following are function of crm system except （）

单项选择题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

单项选择题analyzing，tracing，prioritizing and agreeing on requirements and then controlling changes and communicating to relevant stakeholders. It is a（）process throughout a project. A requirement is a capability to which a project outcome（product or service）should conform.

A、persistent
B、continuing
C、permanent
D、continuous