Consider the following table called 'Student' Student
| Roll No | Name | Mobile | City |
| 1 | Arun | 91 | Delhi |
| 2 | Sanjay | 92 | Mumbai |
| 3 | Arun | 93 | Noida |
| 4 | Varun | 94 | Guwahati |
| 5 | Arti | 95 | Kolkata |
How many candidate keys are possible with above table?
1
One
2
Two
3
Three
4
Four