A butterfly valve was found leaking and has to be overhauled. Which of the following is a correct statement?

A. There is no need to remove the valve from pipeline and it can be overhauled in place
B. Butterfly valves cannot be overhauled without removal from pipelines
C. It is better idea to remove the valve from pipeline and then carry out the maintenance rather than do it in place
D. It will depends on the time available to you, whether you will remove valve from pipeline or overhaul in place