If you are testing a set of signal changes at a railway station, which technique would you most likely use?

It is possible that the test execution phase will be shortened and that test cases will need to be prioritised.
What is the main reason to prioritise the test cases?

Which of the following fits the principles of experience-based testing?

One limitation of pairwise testing is that it ...

Scenario "Banking Project"
As a test analyst in the banking domain you have received the following requirement:
"The system shall allow cash advances of at least 200 Euros for all supported credit cards, The correct list of credit cards is American Express, Diners, VISA, Mastercard and Eurocard. For the ATM banking project introduced earlier; "When the user first inserts a valid credit card type, 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 proper PIN code. When authenticating the user, the system shall allow the user to enter their PlN 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 exact number of invalid PIN codes entered, the system might behave improperly.
Which of the following test design techniques is specifically targeted at such failures?