If the following pseudocode was coded and executed, what would display?
```
Declare String str = "a1b2c3d4"
Declare Integer index
Declare Integer num = 0
For index = 0 To length(str) - 1
If isDigit(str[index]) Then
Set num = num + 1
End If
End For
Display num
```
a. 3
b. 0
c. 5
d. 4
d. 4
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