The correct answer is: D. both (a) and (b)
The model base cannot be prepared until the computer has been selected and the MIS staff has been acquired and organized.
The computer is the hardware that will be used to run the model base. The MIS staff is the people who will be responsible for developing and maintaining the model base. Both of these are necessary before the model base can be prepared.
Option A is correct because the computer must be selected before the model base can be prepared. The computer will be used to run the model base, so it is important to select a computer that is powerful enough to handle the demands of the model base.
Option B is correct because the MIS staff must be acquired and organized before the model base can be prepared. The MIS staff will be responsible for developing and maintaining the model base, so it is important to have a qualified staff in place before the model base can be prepared.
Option C is incorrect because the preparation of physical facilities is not necessary before the model base can be prepared. The model base can be prepared on any computer, so there is no need to prepare physical facilities specifically for the model base.
Option E is incorrect because both (a) and (b) are necessary before the model base can be prepared.