You are testing an ATM based on the following use case;
ATM start screen is showing
1. The user inserts card
2. The user types in PIN
3. The user selects `cash with receipt’
4. The user selects 50
5. The user selects `no further service’
Expected results
– The ATM provides 50 to the user
– The ATM return the card and balance slip
– The ATM clears the screen
– The ATM returns to start menu
In your test log which of the following could be noted as part of additional attention points?
A. Issues regarding time-behavior
B. Issues regarding interoperability
C. More test cases needed to achieve full coverage
D. Expected results not clearly defined
Can someone care to explain why this is A rather than C (or possibly D)?