The following SQL is which type of join:

SELECT CUSTOMER$\_$T$.$ CUSTOMER$\_$ID$,$ ORDER$\_$T$.$ CUSTOMER$\_$ID$,$ NAME, ORDER$\_$ID FROM CUSTOMER$\_$T$,$ORDER$\_$T WHERE CUSTOMER$\_$T$.$ CUSTOMER$\_$ID $=$ ORDER$\_$T$.$ CUSTOMER$\_$ID

Select one:

a$.$

Natural join

b$.$

Equi$-$join

c$.$

Outer Join

d$.$

Cartesian Join