Final answer:
The reticular formation is found throughout the brainstem, including the midbrain, medulla, and pons; it is key in regulating sleep, arousal, alertness, and motor activity. Option d.
Step-by-step explanation:
The reticular formation is a network of neurons located throughout the brainstem, which includes the midbrain, the medulla, and the pons. This area is crucial for various functions such as regulating the sleep/wake cycle, arousal, alertness, and motor activity.
The reticular formation is responsible for maintaining consciousness and is actively involved in controlling autonomic functions.
The correct answer to the question 'Where is the reticular formation found?' is d. all of the above, meaning it spans across the midbrain, pons, and medulla.
So Option d is correct.