An OR expansion project involves building two new operating rooms, renovating two existing operating rooms, and upgrading the PACU. The agency construction manager is requested to develop a phasing plan. The BEST approach to minimize disruption to the facility and control costs is to

A. Renovate one existing OR at a time, then the PACU, and then build the new ORs.

B. Build the two new operating rooms, open them, and then renovate the existing ORs and PACU.

C. Upgrade the PACU and then renovate one existing OR at a time

D. Build one new OR to be used while renovating the other operating rooms, then build the other new OR to use while renovating the second OR, and then renovate the PACU