iSQI Exam CTAL-TA_Syll2019 Topic 8 Question 24 Discussion

For an ATM banking project the following applies: "When the user first inserts a valid credit card, the system considers the user to be in an unauthenticated state. When requesting a cash advance, the user must be in an authenticated state. The user authenticates by entering the correct PIN code for the card they have used. During the user authentication, the system shall allow the user to enter their PIN code up to three times before failing the authentication and rejecting the card. On the first and second try, the system shall prompt the user to re-enter the PIN code " Suppose you are concerned that, depending on the number of invalid PIN codes entered, the system may behave incorrectly. Which of the following test design techniques is specifically targeted at finding such failures?