What will be the final value of c in the following C code

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What will be the final value of c in the following C code snippet? (Initial values: p = 1, q = 2, r = 1)
```
r += (-r) ? p : q;
```

1. r = 2
2. r = 3
3. r = 1
4. Syntax Error
5. None of these

Correct Option: A

r = 2