What method can users use to protect sensitive data in Google Sheets?

Restricting access and implementing permissions in Google Sheets is the most effective method for protecting sensitive data. This approach allows users to control who can view, edit, or comment on the spreadsheet. By setting specific permissions, users can ensure that only authorized individuals have access to sensitive information. This is essential in a collaborative environment, where data security and privacy are critical.

Making the spreadsheet public, for instance, would expose the data to anyone with the link, thereby increasing the risk of unauthorized access. Complex coloring for cells and limiting the use of formulas do not provide actual security measures; they may help with visual organization or clarity but do not protect data from unauthorized access or breaches. Therefore, managing permissions is the key method for safeguarding sensitive information in Google Sheets.