Which of the following anaesthesia will produce decreased EEG activities –

Activation of EEG :- Inhalational agent (subanesthetic doses), Barbiturates (small dose), Benzodiazepines (small doses), Etomidate (small doses), Nitrous oxide, Ketamine, Mild hypercapnia, Sensory stimulation, Hypoxia (early). Depression of EEG :- Inhalational agents (1-2 MAC), Barbiturates, opioids, propofol, etomidate, hypocapnia, marked hypercapnia, Hypothermia, Ischemia, Hypoxia (late).