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
Please explain answer of this Question. Thanks