When mobile payment service applications (PayPal ; Venmo) were created, there was an overall increase in transactions. According to the AD-AS model, in the short run, how would prices and output change?

A. Prices would stay the same, output would increase

B. Prices would decrease, output would decrease

C. prices would stay the same, output would decrease

D. prices would increase, output would stay the same

E. prices would increase, prices increase