Answer:
Debit Cash and credit Deferred Revenue for $2,500.
Explanation:
Deferred revenue can be described as an advance payment thta is received a business for services to be performed or goods to be delivered in the future.
This type of revenue will not be reported in the income statement but it will be reported as a liability under the current liabilities in the balance sheet, after debiting the cash account, until when the services are performed or goods are delivered.
For this question, $2,500 deposits received in 2018 from customers for advertising services to be performed in 2020 will not be reported in the 2018 income statement but it will continue to be reported as a liability under the current liabilities in the balance sheet till 2020 when the services are performed.
Thereofe, the correct journal entry that will be used to record activity #3 is Debit Cash and credit Deferred Revenue for $2,500.