Consider the two relations R and S, as given below:

R S

A 1

B 2

D 3

F 4

E 5

A 1

C 2

D 3

E 4

Solve the following:

a. R union S. [0.25 Point]

b. R intersection S [0.25 Point]

c. R-S [0.25 Point]

d. S-R [0.25 Point]