The correct answer is A. Validation.
Validation is the process of checking the collected data to ensure optimal quality level. It is a critical step in the data collection process, as it helps to ensure that the data is accurate, complete, and consistent. Validation can be done manually or automatically, and it typically involves checking the data for errors, inconsistencies, and missing values.
Editing is the process of correcting errors in the collected data. It is a necessary step in the data collection process, as it helps to ensure that the data is accurate and reliable. Editing can be done manually or automatically, and it typically involves checking the data for errors in spelling, grammar, and punctuation.
Classification is the process of assigning data to categories. It is a necessary step in the data analysis process, as it helps to organize the data and make it easier to understand. Classification can be done manually or automatically, and it typically involves assigning data to pre-defined categories.
Entry is the process of entering data into a computer system. It is a necessary step in the data collection process, as it allows the data to be stored and analyzed. Entry can be done manually or automatically, and it typically involves entering data into a spreadsheet or database.
In conclusion, the process of thoroughly checking the collected data to ensure optimal quality level is referred to as validation.