For each of the following incorrect entries.

Entry	Description	Debit	Credit
a.	Office Supplies	1,800
	Cash		1,800
	(Purchase of office supplies on credit.)
b.	Cash	4,500
	Revenue		4,500
	(Received from customer. A credit customer paid their account in full)
c.	Salaries Expense	1,500
	Cash		1,500
	(Withdrawal of cash for personal use.)
d.	Cash	750
	Accounts Receivable		750
	(Performed services and received payment from customer on the same day.)