Bank–customer confidentiality has its origin in the English case:
AFoley v Hill
BTournier v National Provincial BankCORRECT
CDonoghue v Stevenson
DSalomon v Salomon
CIBNBanking Law
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Why the answer is B, and why the others tempt you.
Tournier v National Provincial & Union Bank (1924) lays down the banker's duty of secrecy and its four exceptions.
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