新设尚未开始使用及应撤除尚未撤掉的信号机，均应装设信号机（），并应熄灭灯光。

What is the purpose of a project charter ？（）

A．To address and document the characteristics and boundaries of the project and its associated products and service

B．To formally authorize the project and provide the project manager with the authority to apply organizational resource

C．To link the project，which is going to be planned，executed，and monitored/controlled to the ongoing work of the organizatio

D．To break down the scope of the project into smaller，better manageable components for further planning and estimatin