ANSWER:
(3). It processes visual, auditory, and touch stimuli
(4). It keeps the cerebral cortex in an alert, awake state
EXPLANATION:
The reticular activating system (RAS) is a network of neurons located in the brain stem that project anteriorly to the hypothalamus to mediate behavior, as well as both posteriorly to the thalamus and directly to the cortex for activation of awake, desynchronized cortical EEG patterns
The RAS processes visual, auditory, and touch stimuli.
The RAS also keeps the cerebral cortex in an alert, awake state