Which ONE of the following is a possible explanation for a debit balance on the purchase ledger account of a supplier?

Which ONE of the following is a possible explanation for a debit balance on the purchase ledger account of a supplier?

(i) An invoice has been posted twice

(ii) A credit note has been posted twice

(iii) A payment has been recorded against the wrong supplier account

(iv) A payment has been posted twice

(v) A contra was posted to the supplier account but not the customer account

(vi) Goods returned had been posted to the wrong supplier account
A . (i) and (ii) only
B . (iii) and (iv) only
C . (i), (ii) and (iv) only
D . (ii), (iii) and (iv) only
E . (i), (ii) and (v) only
F . (iii), (iv) and (vi) only