Explanation:
Data validation is a feature in Excel that allows you to control the type of data that is entered into a cell or range of cells. It helps to ensure that the data entered is accurate and meets specific criteria.

The options for data validation in Excel include:
a) Whole number: This option allows you to specify that only whole numbers can be entered into a cell or range of cells. It is useful when you want to restrict the data to integers and prevent any decimal values.

b) Decimal number: This option allows you to specify that only decimal numbers can be entered into a cell or range of cells. It is useful when you want to restrict the data to numbers with decimal places.

c) Text length: This option allows you to specify a minimum and maximum length for the text entered into a cell or range of cells. It is useful when you want to restrict the length of the text and ensure that it falls within a specific range.

Answer:
d) Percentage: This option is NOT a data validation option in Excel. However, you can achieve similar functionality by using a custom formula or by using the "between" option and specifying a range of values between 0 and 100.

Data validation in Excel provides a powerful tool for ensuring data accuracy and integrity. By using these options, you can control the type of data that is entered into cells and reduce the chances of errors and inconsistencies in your spreadsheets.