With x = 0, which of the following are legal lines of Java

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With x = 0, which of the following are legal lines of Java code for changing the value of x to 1?
```
   1. x++;
   2. x = x + 1;
   3. x += 1;
   4. x =+ 1;
```

1. 1, 2, 3 & 4
2. 3 & 2
3. 1 & 4
4. 1, 2 & 3
5. None of these

Correct Option: A

Operator ++ increases value of variable by 1. x = x + 1 can also be written in shorthand form as x += 1. Also x =+ 1 will set the value of x to 1.