Required:

Which types of input controls would best mitigate the following threats?

$\backslash$table$[[$Threat$,$Input Controls$],[$a$.,$Posting the amount of a sale to a customer account that does not exist.,$\backslash$table$[[$Authorization $($for sales transactions$)$ or the use of a validity check on the$],[$customer number.$]]],[$b$.,\backslash$table$[[$A customer entering too many characters into the five$-$digit zip code while$],[$making an online purchase, causing the server to crash.$]],],[$c$.,$An intern's pay rate was entered as $$150$ per hour, not $$15$ per hour.,$],[$d$.,\backslash$table$[[$Approving a customer order without the customer's address so the order$],[$was not shipped on time.$]],],[$e$.,\backslash$table$[[$Entering the contract number of a critical contract as $13688$ instead of$],[16388,$ which is a serious mistake for the company.$]],]]$