Which Is a True Statement About IT Projects

Which is a true statement about IT projects?

A) Most IS departments face a demand for IT projects that far exceed the ability to do them.
B) Project Managers must be certified as PMP (Project Management Professionals)
C) Project estimates tend to have a built-in buffer of time
D) Project teams of 12 to 15 are generally considered optimum
E) The majority of projects taken on by IT departments are not strategic to the business