A certain nuclear power plant is decommissioned. Several years later, the large building in which the plant was housed is completely empty. The people who worked to decommission the plant experienced some problems with nausea and anemia as a result of their work, but there have been no lasting effects. Which decommissioning process did this plant most likely undergo?

I. DECON
II. SAFSTOR
III. ENTOMB

A. I only
B. II only
C. III only
D. I and II only
E. II and III only