The one-liner code that concatenates all strings passed

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The one-liner code that concatenates all strings passed into a function is

1. function concatenate()
  {
  return String.concat.apply('', arguments);
  }
2. function concatenate()
  {
  return String.prototype.concat('', arguments);
  }
3. function concatenate()
  {
  return String.prototype.concat.apply('', arguments);
  }
4. function concatenate()
  {
  return String.prototype.apply('', arguments);
  }
5. None of these

Correct Option: A

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array. apply takes an array of arguments and treats each element of that array as a single argument.