Describe, step by step, how we can map the field of variable quantity

Following are the steps through which a field of variable quantity can be mapped:

Step I: Choose a temporary benchmark (TBM). It should be stationary and unalterable. Step II: Plot temporary reference points on the field with the TBM as the master reference point. Step III: Take measurements of the features and quantities like trees, rocks, buildings (if any), elevations, etc., present in the field from the temporary reference points. Step IV: Mark the quantities on the map based on the measurements obtained from the field. Explanation: To map a field of variable quantity, it becomes necessary to go step-by-step in order to bring accuracy in the process of mapping. The steps described above help in bringing precision in mapping and leave no room for error.

Dall of the above all of the choices make sense

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