Your boss in the human resources department asks you to write a function that calculates the length of time that employees have been with the firm, using the DATEDIF function. Assume that C$2$ contains the hire date for a given employee, and that cell AE$2$ contains the cut$-$off date against which to compare the hire date to determine the length of service.What is the correct formula to determine the length of employment in complete months?O$-$DATEDIF$($$AE$$2,$ C$2,$ "diff"$)$O$-$DATEDIF$($C$2,$ $AE$$2,"$m$")$ODATEDIF$($C$2,$ $AE$$2,$ "date"$)$O$=$DATEDIF$($$AE$$2,$ C$2,"$mth$")$