Try to identify the basal side facing towards the lamina propria and the apical side bordering the lumen. Which is correct?
1) Basal side faces towards the lamina propria and apical side borders the lumen
2) Apical side faces towards the lamina propria and basal side borders the lumen
3) Both basal and apical sides face towards the lamina propria
4) Both basal and apical sides border the lumen