Companycom is migrating from p670 systems running AIX 5.2 to p5 595 systems running AIX 5.3. They will be changing out only the system units. They will re-use the existing 61D drawers and adapters with the new p5 595 systems. What compatibility issue must be considered?（） 

• A、APV features are not supported for some legacy POWER4 adapters
• B、APV will require the most current maintenance level for AIX 5.2
• C、APV features will require that legacy POWER4 adapters be updated with new microcode
• D、The Virtual IO Server must run AIX 5.3 and the LPARs can run either AIX 5.2 or AIX 5.3