$1.$ Which one of the following represent the most liquid asset?

a$.$ $$500$ accounts receivable that is discounted and collected for $$480$ today

b$.$ $$500$ worth of inventory that is sold today on credit for $$515$

c$.$ $$500$ worth of inventory that is sold today for $$500$ cash

d$.$ $$500$ worth of inventory that is discounted and sold today for $$485$ cash

e$.$ $$500$ of accounts receivable that will be collected in full next week