We can save and protect the workbook by

The correct answer is d) Any of the above.

You can save and protect a workbook by setting a password. There are several types of passwords that you can use:
a) Write Reservation Password: This password prevents unauthorized users from making changes to the workbook.
b) Protection Password: This password prevents unauthorized users from opening the workbook.
c) Read-Only Recommended: This option marks the workbook as read-only and recommends that users open it in read-only mode. However, users can still choose to edit the workbook if they wish.

You can use any of the above options to save and protect your workbook.