A project has four activities. Activity A has no predecessors and a duration of 1 week. Activity B has Activity A as its predecessor and a duration of 4 weeks. Activity C has Activity A as its predecessor and a duration of 3 weeks. Activity D has activities B and C as its predecessors and a duration of 2 weeks. What is the length of critical path for this project?
a. 4
b. 5
c. 7
d. Cannot be determined from the information given
c. 7
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