The correct answer is Tokenization, as it replaces sensitive data with unique identification symbols that retain all the essential information about the data without compromising its security. This method is particularly suitable for individual data elements, such as those found in a customer database, as it allows for routine operations such as data processing to continue without exposing the actual sensitive data. On the other hand, Data Masking is typically applied to whole datasets rather than individual fields and often used for development and testing environments. Data masking also might not be reversible, which could interfere with certain operations. Database Encryption would not allow individual elements to be processed in a routine manner, and Salting is generally used in the context of password storage, to add uniqueness to hashes rather than to obfuscate individual data elements.