Identify the correct operation which produces the below given output based on 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 |
Choose the correct answer from the options below:
1
R1 ⋂ R2
2
R1 - R2
3
R1 - (R1 - R2)
4
Option 1 and 3 both