Answer:
4. meter rod
Step-by-step explanation:
The length of an object is dimension that expresses how long the object is. It is measured in meters as the SI unit.
From the given question, to determine the length of a given table, the appropriate instrument that should be used is a meter rod. This would make it possible to measure in meters and know the exact dimension of the object with respect to how long it is.
A meter rod has a length of 1 m (100 cm), and can be easily used for the purpose.