Your firm,which is on the accrual basis, receives a 10% commission on sales. When SyCo signs up it pays you $500 in advance,which you credit to Unearned Revenue. If,at year end,your firm has achieved $20,000 in sales,what adjusting entry do you record?

a.Revenue $2,000- Unearned Revenue $2,000

b.Cash-$2,000, Revenue $2,000

c. Unearned revenue $2,000- revenue $2,000

d. unearned revenue $500- revenue $500