Build an excel 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 frrequency of compounding may be either an uppercase or a lower case 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