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Question :-

During an upgrade, the ESXi 5.x installer finds an existing version of ESXi and a VMFS3 volume. No virtual machines exist on the host or VMFS3 volume. The requirement is to upgrade to VMFS5. Which option should be chosen to meet this requirement?
Upgrade ESXi and preserve the VMFS datastore
Install ESXi and preserve the VMFS datastore
Install ESXi and overwrite the VMFS datastore
Upgrade ESXi and overwrite the VMFS datastore

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