Which situation would result in revenue recognition on the income statement for the year ending 12/31/15 if the company is using accrual-basis accounting?

a.An airline company sells tickets in 2015 for flights that passengers will take in 2016.

b.A retail company sells merchandise on credit to a customer in December 2015.The customer pays for the merchandise purchased in January 2016.

c.In 2015, an architectural company enters in contract with a customer to provide services in 2016.

d.In 2015, a company collects cash from a customer for services they provided to the customer in 2014.