Which one of the following statement is correct for positive feedback? Select one: a. A positive feedback system is stable over time, maintaining a steady state. b. Positive feedback occurs when a...

Extracted text: Which one of the following statement is correct for positive feedback? Select one: a. A positive feedback system is stable over time, maintaining a steady state. b. Positive feedback occurs when a system moves from one set point to another. One type of positive feedback moves the control parameter to a value outside that normally maintained by negative feedback. c. A positive feedback loop is a control system that acts to maintain the level of some variation within a given range following a disturbance. d. Step changes in a controlled variable will return the system to its original state using positive feedback.