The following PMP® exam sample question is taken from the Free PMP Exam Simulator at http://free.pm-exam-simulator.com - The answer is at the very bottom:

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You are working on a web development project. You looked on the internet for some off-the-shelf software to support the project. Your internet search may lead to better products but which of the following problems are associated with those products?

A.) Off-the-shelf-products always charge variable rates.