The 20/80 rule (Pareto Principle) of project time management refers to what? Select one: 

80% of the GANTT chart will be completed on schedule 

20% of the time 20% of the GANTT chart will be completed on schedule 

80% of the time 80% of the outputs will be generated by only 20% of the inputs 

80% of the inputs will be generated by only 20% of the outputs