Given the following pseudocode, what value of GRADE will be output if 60 is input?

```
Start
Read GRADENUM
CASENTRY GRADENUM
CASE 90 ? GRADENUM ? 100
GRADE = “A’
CASE 80 ? GRADENUM < 90
GRADE = “B’
CASE 70 ? GRADENUM < 80
GRADE = “C’
CASE 60 ? GRADENUM < 70
GRADE = “D’
CASE other
GRADE = “F”
ENDCASE
Write GRADE
Stop

```

a) B
b) C
c) D
d) F

c) D