What are the fundamental operations of the algebra relational language? I- Selection II- Projection III- Union IV- Set difference V- Cartesian pro...

What are the fundamental operations of the algebra relational language?

I- Selection
II- Projection
III- Union
IV- Set difference
V- Cartesian product
VI- Renaming
a) I, II, III, IV, V and VI
b) I, II, III and IV
c) II, III, IV and V
d) I, III, V and VI