Algorithms, Data Structures and Computability

plz quickly

D) For each of the following scenarios select the "best" data structure that should be used: 1) Counter at the airport-serving customers based on "come first served first". 2) Representing the relation between relatives in a family. 3) A structure that has flexible memory management and its data change frequently 4) A browser that needs to remember operations it performed in opposite order. (4 marks: 1 mark each)