The reticular activating system (1 pt)

a. is a region of forebrain that activates the rest of the brain.

b. is a thalamocortical loop involved in attention.

c. includes a group of brainstem cholinergic neurons that induces wakefulness.

d. defines a cerebellar region that becomes active at the end of a sleep cycle.

e. is a reticular or mesh-like network that wraps around the cerebrum.