There are many causes of variation in project costs. Which of the following accurately describes the nature of this variation?
a. Variation is generally greater on projects that use well-known technology and an experienced project team.
b. Variation occurs in all work processes and the novelty associated with most projects creates many opportunities for variation.
c. Special cause variation comes from many small causes that are inherent in a work process.
d. Normal cause variation is when something out of the ordinary occurs