Which of the following is not a use case?

a)

Check Out a Book

b)

Click the Submit Button

c)

Make Deposit

d)

Buy Item

Answer:b) Click the Submit Button

Explanation: Use case is used for the display of the clarity and organization of the particular system. It is use case acts ac the actors which play a certain role in the system's surrounding. The actor can be internal or external agent.

The interaction of the actor does not take place with the surrounding by clicking the Submit button. This act does not require to be performed in the series of action and has no internal or external agent rather can be just completed by clicking action.

Other cases are use case because they require sequence or steps to be carried out. Thus, option (b) is not a use case.