Requirements management is the process of （1），analyzing，tracing，prioritizing and agreeing on requirements and then controlling changes and communicating to relevant stakeholders. It is a（2）process throughout a project. A requirement is a capability to which a project outcome（product or service）should conform.
（1）A、communicating
B、collecting
C、filing
D、documenting
（2）A、persistent
B、continuing
C、permanent
D、continuous