小儿液体疗法静脉补液过程中需做到“三先”，即________、________和先浓后淡。

A customer informed you that it is preferable to change a certain aspect of the project. What should you do first ？（）

A．Talk with team members to understand implications of the change.

B．Communicate the change to the management to get their inputs.

C．Open up a change control.

D．Do sizing for the change and communicate to the customer.