Which of the following best describes data masking?

A. A method for creating similar but inauthentic datasets used for software testing and user training.
B. A method used to protect prying eyes from data such as social security numbers and credit card data.
C. A method where the last few numbers in a dataset are not obscured. These are often used for authentication.
D. Data masking involves stripping out all digits in a string of numbers so as to obscure the original number.