Asurvey reveals that the sales of smartphones is increasing considerably. the average annual sales of smartphones, in million units, n years after the survey is conducted is modeled by function p below. the parameter b is an unknown positive base. which statement is true about this situation? a. when the survey was initially conducted, the average sales of smartphones was 1.7 million units. b. if b = 1.45, the annual growth rate of the sales of smartphones is 145%. c. the average annual sales of smartphones increases by 1.7 million units every year. d. if b = 1.02, the annual sales of smartphones will double in 2 years.