If the following pseudocode was coded and executed, what would display?
```
Declare String str = "a1b2c3d4"
Declare Integer index
For index = 0 To length(str) - 1
If isLetter(str[index]) Then
Set str[index] = "+"
End If
End For
Display str
```
a. +1+2+3+4+
b. +1+2+3+4
c. 1+2+3+4
d. a+b+c+d+
b. +1+2+3+4
Computer Science & Information Technology
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