Which of the following system implementation models has
the advantage of achieving a full operational test of the new system
before it is implemented?

(a) The requirement is to identify the implementation
model that has the advantage of a full operational test of the system
before it is implemented. Answer (a) is correct because with
parallel implementation both systems are operated until it is
determined that the new system is operating properly. Answer
(b) is incorrect because with the plunge model the new system is
put into operation without a full operational test. Answer (c) is
incorrect because with pilot implementation the system is only
tested with a pilot group. Answer (d) is incorrect because with
the phased implementation the system is phased in over time.