Members of a Project Team Have Developed a Schedule for an Upcoming

Members of a project team have developed a schedule for an upcoming IT project. They observe that two activities, A. Hardware Design and B. Software Design, must be complete before a third activity, C. Testing, can begin. Hardware and Software Design share the same predecessor task, and each one is estimated to have a duration of 4 weeks. Based on historical data, team members estimate that activity A and activity B each has an 80% chance of finishing within the estimated time frame. Which of the following is true?

A) Conjunctive event bias might cause the team to underestimate the likelihood that A and B will be completed within 4 weeks. i.e., they will think it is less likely than it really is.)
B) The likelihood of A and B both finishing within 4 weeks would be 90%.
C) The likelihood of A and B both finishing within 4 weeks would be 64%.
D) Conjunctive event bias might cause the team to overestimate the likelihood that A and B will be completed within 4 weeks. i.e., they will think it is more likely than it really is.)
E) A and B only
F) C and D only