Which statement is correct?

Group of answer choices

A plan is a forecast and as such has some level of uncertainty

$$Concrete pour$$ is a well$-$defined task for a weekly plan.

Milestones should be elicited in the look$-$ahead plan

Gantt charts show the location in which construction activities take place similarly to the Line$-$of$-$Balance $($LOB$)$ diagrams.

The weekly plan should be defined by the external client only