Indicate which of the following errors, each considered individually, would cause the trial balance totals to be unequal:
a. A payment of $2,150 to a creditor was posted as a debit of $2,150 to Accounts Payable and a debit of $2,150 to Cash.
b. A fee of $4,600 earned and due from a client was not debited to Accounts Receivable or credited to a revenue account, because the cash had not been received.
c. A receipt of $3,100 from an account receivable was journalized and posted as a debit of $3,100 to Cash and a credit of $3,100 to Fees Earned.
d. A payment of $10,000 for equipment purchased was posted as a debit of $1,000 to Equipment and a credit of $1,000 to Cash.
e. Payment of a cash withdrawal of $15,000 was journalized and posted as a debit of $5,000 to Salary Expense and a credit of $15,000 to Cash.