Answer:
The correct answer is - must be honest and without bias or later change.
Step-by-step explanation:
In an experiment to get the reliable and desired result, one should get collect the data from all possible sources and note it down for reference. This data should not be bias or not influenced by any external factor and solely based on the experiment or associated with the experiment.
Data that is calculated should not be change or edit to support the result or if not getting the desired result. Data should remain unchanged for an honest and unbiased experiment or investigation.