UNIT I
i) The Supertag scanner could revolutionise the way people shop, virtually eradicating
supermarket queues;
ii) The face of retailing will change even more rapidly when the fibre optic networks being
built by cable TV companies begin to be more widely used;
iii) The scanner would have a double benefit for supermarkets - removing the
bottleneck which causes frustration to most customers and reducing the number of
checkout staff;
iv) An electronic scanner which can read the entire contents of a supermarket trolley
at a glance has just been developed.
The best sequence is:

• ii, i, iii, iv

• iv, i, iii, ii

• iv, iii i, i

• iv, iii i, i