Identify the true statement by selecting the best choice.

a. Good quality is positively correlated with profitability.

b. If you firstt browse a series of web pages and then backup through those pages using the Back icon, you are processing a LIFO queue.

c. Queues cann appear and disappear suddenly, and can defy logic.

d. It is good practice for a mannager (who is supervising queues) to focus on the psychology of customers in the queue (e.g., keepinng customers in the queue occupied and/or informing customers about their expected wait time).

e. All of the above (i.e., a, b, c, and d are true).