Which of the Following Best Describes the Condition of Steady-State

Multiple Choice

Which of the following best describes the condition of steady-state equilibrium?

A) system inputs always exactly balance outputs so the system never changes.
B) system inputs and outputs fluctuate around a stable average so the system does not move far from its average condition.
C) system inputs produce large,random fluctuations in output,forcing the system into a new state of equilibrium.
D) systems slowly adjust to long-term changes in input and output.
E) system inputs and outputs do not change and the average remains the same over time.