Length of one rod is 2.53 cm and that of the other is 1.27 cm. The least count of measuring instrument is 0.01 cm. If two rods are put together end to end, the combined length can be expressed as
(3.80 `+-` 0.01)cm
(3.80 `+-` ``0.02)cm
``(3.80 `+-` 0.03)cm
(3.80 `+-` 0.04)cm