Four children measured the length of a table which was about 2 m. Each of them used different ways to measure it. i. Sam measured it with a half metre long thread. ii. Gurmeet measured it with a 15 cm scale. iii. Reena measured it using her handspan. iv. Salim measured it using a 5 m long measuring tape. Which one of them would get the most accurate length? Give reason for your answer.