javascript online questions

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JavaScript Online Question

What is the outupt of the following snippet

function sum(a) {
  var sum = a;
  function f(b) {
    sum += b;
    return f;
  }
  f.toString = function() {
    return sum;
  }
  return f;
}

console.log(sum(0)(1)(2)(3)(4)(5)); // 15

Answers:

1. 012345
2. 12345
3. 1
4. None of these