also, please explain why it is classified like that

5 Classify the type of following transactions (deferred expense, deferred revenue, accrued expense and accrued revenue) A. Paid six months of rent, $4,800 B. Received $1,200 from customer for six-month service contract that began 10 days ago C. Purchased $300 of office supplies on account D. Work performed but not yet billed to customer, $500 E. Employees earned $600 in salaries that will be paid next month