The critical path of a project has the duration with mean 68 days and variance 78. A second path in the project from start to end has the duration 59 days and variance 140. The probability of completion of critical path in 80 days is 91%, while the probability of completion of the non-critical path in 80 days is 96%. What is the probability of completion of the project in 80 days?

91%

96%

87%

84%