a certain nuclear power plant is decommissioned. several decades later, the large building in which the plant was housed remains encased in concrete. the people who worked to decommission the plant—now in their 40s and 50s—did not experience radiation sickness as a result of their work. which decommissioning process did this plant most likely undergo? (2 points)

i : decon
ii: safstor
iii: entomb