Identify the correct operation that produces the given output from the two relations R1 and R2.

R1

Name	Class
a1	9
b1	5
c1	6
d1	11

R2

Name	Class
b1	5
f1	8

Output

Name	Class
b1	5

1. AR1 ∩ R2
2. BR1 − R2
3. CR1 − (R1 − R2)
4. DR1 ∪ R2

Pick an option to check yourself, or open the answer below.