Build the worksheet in two different ways: Assuming that the frequency of compounding will always be specified by a valid uppercase letter $($A$,$ Q$,$ M$,$ or D$).$Assuming that the frequency of compounding may be either an uppercase or a lowercase letter, which may or may not be valid $($i$.$e$.,$ the frequency of compounding may be some letter other than A$,$ Q$,$ M$,$ or D$).$ Display the message $$Data Error$$ if the letter indicating the frequency of compounding is invalid.