What is clipboard leakage in mobile security, and what specific iOS version added a user-visible warning banner for apps reading the clipboard without user action?

• A.C) Only Android displays clipboard warnings; iOS does not notify users when apps read clipboard content.
• B.B) iOS 16 introduced clipboard warnings; before iOS 16 apps could silently read the clipboard without any user notification.
• C.A) Clipboard leakage occurs when sensitive data (passwords copied from a password manager, cryptocurrency wallet addresses, 2FA codes) is read from the clipboard by background apps or malicious apps; iOS 14 introduced a banner notification ("[App] pasted from [source]") that appears when an app accesses clipboard content without a user-initiated paste action.
• D.D) Clipboard leakage is prevented entirely by Android's and iOS's sandboxing; no app can read another app's copied data.