Which of the following statements is of inverse variation?

(1) The number of workers on a job and time taken by them to complete the job.

(2) The number of pipes of the same size to fill a tank and the time taken by them to fill the tank.

(3) Petrol filled in the tank of a vehicle and its cost.

(4) Area of the circle and its radius.

(1) Yes, it is of inverse variation because more the number of workers will be lesser time will be taken.

(2) Yes, it is of inverse variation because more the number of pipes will be lesser time will be taken.

(3) No, it is not of inverse variation because the cost of petrol will increase with respect to its quantity.

(4) No, it is not of inverse variation because a larger circle has a longer radius.