How does the optimal point of entry change, when the rate of technological change and firms' mobilization capability in a market increase?

a. Firms that delay their entry until just before the number of designs decreases will tend to perform better

b. Firms that rush their entry to before the number of categories starts to decrease will tend to perform better

c. Firms that delay their entry until after the number of designs decreases will tend to perform better

d. Firms that rush their entry, but enter right after the number of categories starts to decrease will tend to perform better