The measurements below were made on four different balances: i. 2.5 g ii. 2.53 g iii. 2.5201 g iv. 2.540 g. A student takes a reading from a balance where the display fluctuates between 2.4 g and 2.6 g. Which of the four balances was used?
1) 2.5 g
2) 2.53 g
3) 2.5201 g
4) 2.540 g