Analyse the following highly simplified procedure:

Ask: ”What type of ticket do you require, single or return?” IF the customer wants ‘return’ Ask: “What rate, Standard or Cheap-day?” IF the customer replies ‘Cheap-day’ Say: “That will be £11:20” ELSE Say: “That will be £19:50” ENDIF ELSE Say: “That will be £9:75” ENDIF Now decide the minimum number of tests that are needed to ensure that all the questions have been asked, all combinations have occurred and all replies given.

  • A. 3
  • B. 4
  • C. 5
  • D. 6

Answer: Option A