Option 2
CBSE(60) ->
60<100 so, x=CBSE(70)
...................................80
............................................90
......................................................100
100 is not < 100 SO CBSE(100) Returns 100-1=99
cbse(90) returns 98
cbse(80) returns 97
cbse(70)returns 96
cbse(60) returns 95
therefore ans 95