Four numbers are written in seven-segment digits just above a pond. Which of them looks exactly the same in its water image?

Water keeps the order of the digits and turns each one upside down, so a number is unchanged only if all its digits have a horizontal line of symmetry: 0, 3 and 8. 3083 uses only those. 3058 has a 5 (it turns into a 2), 8130 has a 1 and 6003 has a 6.