Which of the following SELECT statement creates a list of all regions in the Countries table? The column displayed should be called "Regions" and each region should be displayed only once. $($Choose all apply$)$

Select $2$ correct answer$($s$)$

a$)$ SELECT DISTINCT region$\_$id "Regions"

FROM countries;

b$)$ SELECT DISTINCT region$\_$id

FROM countries;

c$)$ SELECT ONCY region$\_$id "Regions"

FROM countries;

d$)$ SELECT UNIQUE region id "Regions"

FROM countries;

e$)$ SELECT UNIQUE region$\_$id

FROM countries;