6. Which of the following statements is FALSE? a. The PPF represents combinations of output that result from the economy producing 100% of its potential (utilizing all available inputs). b. Some inputs are NOT being fully utilized at points A and D. c. It is possible for an economy to produce at a point below its PPF, such as point E. d. A non-linear PPF, such as that pictured above, captures diminishing returns to the production of at least one type of output, with respect to at least one type of input