Which of the following will NOT be a suitable method for the changover of the system?

AB Company is planning to implement a new IT system. The existing system runs all of the financial ledgers and is key to the running of the whole organisation.

Which of the following will NOT be a suitable method for the changover of the system?
A . Phased changeover
B . Direct changeover
C . Parallel changeover
D . Pilot changeover

Answer: B