David is observing a bacterial population. The population doubles every 30 minutes. The function P(x) = 500. 2* models the population, where x is the number of 30-minute periods since David began observing. Identify the y-intercept and the asymptote of the graph of the function. a. y-intercept = 500; asymptote: y = 500

b. y-intercept = 0; asymptote: x = 500

c. y-intercept = 500; asymptote: x = 0

d. y-intercept = 500; asymptote: y = 0