Which one of the following statements is correct ?

Options

1. a.

   The measurement of mass taken by a spring weighing balance is correct at the place where the spring balance is calibrated for

2. b.

   The measurement of mass taken by a spring weighing balance is correct at all places

3. c.

   The measurement of mass taken by a spring weighing balance is correct at the places where the acceleration due to gravity is same with the place where the spring balance is calibrated for

   Correct answer
4. d.

   A spring balance cannot be used to measure mass at any place