Bell provides $$500$ of services to customers on account with terms $\frac{3}{10},\frac{n}{30}.$ The Service Revenue account is credited for $$500.$ If the customer pays within $10$ days, Bell will record which of the following?

Debit Service Revenue $$500$

Credit Cash $$500$

Credit Sales Discount $$50$

Debit Sales Discount $$15$