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Balance b/f (c/f)
is usually appeared in the pages of the ledger account. E.g. in the end of first page, we put balance c/f along the total balance, in the beginning of second page, we use balance b/f.
Balance b/d (c/d)
b/d is usually appeared in the first line of the beginning balance of the account of the balance sheet items ( Assets, Liabilites and Equity). The balance as appeared in the last year's account. c/d is then appeared in the last line with the ending total to be carried forward to nest year.
However, in general practice, provided that these wordings are consistently applied, there is no specific requirement for using 'd' or 'f'.