Which choice defines the term consistency when used to describe the properties of a transaction?

A.
Consistency guarantees that a committed transaction will persist despite any type of system
failure.

B.
Consistency guarantees that a transaction will either result in a new valid system, or the system
will be restored to its original state.

C.
Consistency guarantees that transactions running at the same time will not have access to
each others partial results.

D.
Consistency guarantees that logically related operations are dealt with as a single unit.