Which approach is always valid when migrating data across differing hardware and operating system architectures?

Which approach is always valid when migrating data across differing hardware and operating system architectures?
A . dbexport source system then dbimport into target.
B . ontape backup from source then restore backup onto target.
C . onunload the source to tape and onload the tape to the target.
D . Set up HDR primary and secondary between source and target.

Answer: A

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