If a UI is no longer visible to the user, but you don’t want to destroy it, which method will the system call to release the corresponding resources?

If a UI is no longer visible to the user, but you don’t want to destroy it, which method will the system call to release the corresponding resources?
A . onForeground()
B . onInactive( )
C . onPause()
D . onBackground( )

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Answer: D