A system administrator is preparing to run a preservation install and would like to use and hdisk that was no longer needed in datavg. Which of the following processes should be used to make it available for configuration?（）
- Achdeb -1 hdiskxxx -a pv=clear; chdev -1 hdiskxx -a pv=yes
- Bexportvg datavg; importvg -y rootvg hdiskxx
- Crmdev -1 hdiskxxx; mkdev -1 hdiskxxx -a pv=avail
- Dreducevg datavg hdiskxxx; extendvg rootvg hdiskxxx