Use the DATE$(...)$ function to add months to the previous audit date. You are not allowed to use the

EDATE$(...)$ function.

Document your function NextAudit$\_$CSA using the design recipe linked in the syllabus prefix.

Improve your function NextAudit$\_$CSA by making it modular. We want to separate the concern of the

business rule from the concern of how to apply it to the data. Define a function NextAudit$2\_$CSA which

takes the business rule as a function argument.

NextAudit$2\_$CSA has the arguments as shown in this LAMBDA:

LAMBDA$($last$\_$audit,company$\_$size,audit$\_$result,business$\_$rule,LET$(...)),$

where business$\_$rule is defined by the above LAMBDA. Make use of the LAMBDA helper function MAP

to implement NextAudit$2\_$CSA.

The modular function NextAudit$2\_$CSA has the benefit that it is easy to change the business rule simply

by giving another business$\_$rule function as an actual argument.