New PMP Question & Answers with explanation

You are a project manager for Bluebird Technologies. Bluebird writes custom billing applications for several industries. A schedule change has been requested. From the perspective of the Perform Integrated Change Control process, change is concerned with which of the following?
Select four
Your project progressed as planned until yesterday. Suddenly, an unexpected risk event occurred. You quickly devised a response to deal with this negative risk event using which of the following?
Select one
You are working on a project that was proceeding well until a manufacturing glitch occurred that requires corrective action. It turns out the glitch was an unintentional enhancement to the product, and the marketing people are absolutely crazy about its potential. The corrective action is canceled, and you continue to produce the product with the newly discovered enhancement. As the project manager, you know that a variance has occurred. Which of the following options is true?
Select one
The Delphi method, technology forecasting, and forecast by analogy are examples of what category of forecasting methods?
Select one
Your project is in a bit of trouble. You are in the Control Resources process and the specialized equipment you were expecting for the next set of project tasks is not available. The truck with the equipment was stolen and the vendor providing the machine you need has only two of them. The other is already deployed on another job. Which of the following are true?
Select three