Units And Measurement

Read the following statements An object shall weigh more at pole than at equator when weighed by using a physical balance. : It shall weigh the same at pole and equator when weighed by using a physical balance. : It shall weigh the same at pole and equator when weighed by using a spring balance. : It shall weigh more at the pole than at equator when weighed using a spring balance. Which of the above statements is/are correct?

The nearest star to our solar system is light years away. The distance of this star in Parsec is (Mean distance between the earth and the sun and one light year )