Based on the state diagram above, how many test cases are needed to achieve 1-switch coverage?  

You are working on a new product that will provide an online pizza ordering service. Not everyone wants to create a frequent-eater pizza account, so the user can either log in to their existing account, create an account or proceed as a “guest" user. People with existing accounts have the option to update their accounts including changing address, changing credit card information and changing phone number. New account creation requires the user to enter their address, credit card information and phone number. This information Is validated to be sure the address matches the credit card information. Once the user logs in, they are able to order their pizza. They can request up to five different pizzas and can select different ingredients on each. A user is allowed to pick up to 10 different ingredients per pizza. They can also select from a pre-defined set of ingredients as follows: “meat lovers", “all veggie’, “cheese please’, and “throw it all on". The busiest day of the year for this product will be the day of the final football game of the professional season. In addition to the normal high load, the company will also be running a special on the “cheese please" pizza (buy 3 get 2 more free). The new product will need to handle a load that Is expected to be twice as high as the load on the old product last year. Given this information, what is an important item that should be addressed In the architectural specification?

Which of the following is the best example of a reliability failure for the application?