Which statement is correct? A) If 80% of a task is completed, the "YES" column can be checked for this task on the weekly plan. B) "Right to left" check of schedule is used during the weekly planning sessions. C) Doing and checking are the two main purposes of the Last Planner System (or hierarchical planning systems). D) Reasons for non-completion for weekly tasks should be identified on the long term/master planning session. E) Short term planning should have a high level of detail. A C E B D