hard20 pts · first answer countsiosmobile-securitybackground-work

Keychain read fails in background

A background refresh task runs while the iPhone is locked, reads the auth token from the Keychain and gets errSecInteractionNotAllowed. What is the cause?

A.The Keychain cannot be used by background code at all, so the token should be copied into UserDefaults before the app is suspended so background tasks can read itB.The token was saved with kSecAttrAccessibleWhenUnlocked; items needed in the background should use kSecAttrAccessibleAfterFirstUnlock (the ThisDeviceOnly variant if it should not move to other devices)C.Background tasks have no network accessD.The token has expired on the server

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Keychain read fails in background

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