Which of the following does NOT apply to channel systems?
A) Some channel systems consist of only informal interactions among loosely organized firms.
B) Channel systems do not stand still; they evolve.
C) Some channel systems are formal interactions guided by strong organizational structures.
D) Intermediaries play interchangeable roles in the system.
E) Different types of intermediaries develop and emerge.
Answer: D) Intermediaries play interchangeable roles in the system.