QUESTION 13 In Excel, what is the primary difference between the ISERR and ISERROR functions?  a. ISERROR function can only refer to a single cell while ISERR can refer to a multiple cell range b. There is no difference, ISERR is the short form of ISERROR c. ISERR is a deprecated function used to maintain Lotus 1-2-3 compatibility d. ISERR will not return true when referring to a #N/A! error, but ISERROR will