Regarding the following statement which of the statements

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Regarding the following statement which of the statements is true?
```
const int num = 20;
```

1. Constructs an integer type variable with an as identifier and 20 as the value
2. Declares a variable num with 20 as its initial value
3. Declares a construction num with 20 as its initial value
4. Declares a constant num whose value will be 20
5. None of these

Correct Option: D

Because the const is used to declare non-changeable values only.