Which is not a commonly used type of cell data in Spreadsheet ?

Spreadsheet applications recognize a fixed set of native cell-content types, each processed differently by the program: numeric values (used directly in calculations), text or label content (descriptive, non-computational information), date-and-time values (stored internally as date/time serial data so they support date arithmetic and calendar formatting), and formulas (expressions that compute a result from other cells). Only content the spreadsheet itself can store, format, or compute qualifies as a cell data type.

Checking each option against this classification:

• Numeric value: a genuine cell data type; numbers are stored so they can be summed, averaged, or used inside other calculations.

• Date and time: a genuine cell data type; spreadsheets store dates and times internally so they can be used in date arithmetic and displayed with calendar or clock formatting.

• Label and Formula: both are genuine cell data types; a label is descriptive text used to identify or annotate data, and a formula is an expression that computes a result from values in other cells.

• User authentication: not a cell data type at all; it is a security process that verifies who is using an application, unrelated to the kind of value a cell can hold or compute.

Since numeric values, date and time, and label and formula are all standard cell-content classifications, while user authentication is a security process rather than a data type, the option that is not a commonly used type of cell data in a spreadsheet is User authentication.