MS Project Problem - Suppose we have a complete activity predecessor table (shown below). Using MS roject, enter the activities, their durations and predecessors (use default Fixed Units). If Activity B, Review field sales reports, takes 7 days to complete instead of the 2 days estimated, what happens to the total Duration and why? A) Total Duration does not change because slack not totally used up B) Total Duration does not change because only used up slack that was available C) Total Duration increases by 2 days, because used up 3 days of slack plus 2 additional days D) Total Duration increases by 2 days, because of critical path change, slack not used over available amount