Use the snippet of code for the following question:

```
1. string example = “Deitel”;
2. example = example + “ Books”;
```

a) This will produce an error
b) This will not produce an error; however, line 2 will not change the string example.
c) This will not produce an error, and the string’s value is "DeitelBooks".
d) This will not produce an error, and the string’s value is "Deitel Books".

d) This will not produce an error, and the string’s value is "Deitel Books".