Our innate immune defences can protect us from being colonised by bacterial pathogens. Which of the following statements regarding innate immune defences is CORRECT?
1) Enzymes are present within mucus that can degrade peptidoglycan
2) These are all innate immune defences that function to protect us from being colonised by bacterial pathogens
3) The microbiota can prevent colonisation of bacterial pathogens
4) Our epithelial cells can produce antimicrobials that function to lyse bacteria