The IFERROR function is an error-handling function in Excel used to trap and manage errors produced by other formulas. Its syntax is IFERROR(value, valueiferror). The function first evaluates the value argument (which is typically a formula or cell reference). If the value argument evaluates without an error, IFERROR returns the result of that evaluation. However, if the value argument results in any error (e.g., #N/A, #DIV/0!, #REF!), the function returns the valueiferror argument instead, allowing for a custom message or a default value to be displayed.

A. IFERROR is applied within a formula to prevent an error from being displayed, not to replace errors that already exist in a range.
B. This describes a counting task. Functions like COUNTIF combined with ISERROR would be used to count errors, not IFERROR.
C. This is the definition of the IF function, which evaluates a logical condition, not whether a formula results in an error.

1. Microsoft Corporation. (n.d.). IFERROR function. Microsoft Support. Retrieved from https://support.microsoft.com/en-us/office/iferror-function-c526fd07-caeb-47b8-8bb6-63f3e417f611.

Reference Details: The official documentation states

"The IFERROR function returns a value you specify if a formula evaluates to an error; otherwise

it returns the result of the formula." This directly supports the purpose of returning a custom value/message upon an error.

2. MIT Sloan School of Management. (2016). Excel 2016: Core Part 2

Formulas and Functions. Massachusetts Institute of Technology.

Reference Details: In the "Logical Functions" section on page 10

the IFERROR function is defined as: "Checks whether a formula results in an error

and returns a specified value if it does; otherwise

returns the result of the formula." This confirms its role in handling formula errors.

3. University of California

Berkeley Library. (n.d.). Excel: Formulas & Functions. UC Berkeley Library Data Lab. Retrieved from https://guides.lib.berkeley.edu/excel/formulas-functions.

Reference Details: Under the "Logical Functions" section

it states

"Use the IFERROR function to trap and handle errors in a formula. IFERROR returns a value you specify if a formula evaluates to an error; otherwise

it returns the result of the formula." This reinforces its use for error trapping.