What did Ray Kroc do that set the bar for future franchise opportunities?

Question $1$Select one:

a$.$

He licensed the McDonalds name to a wide variety of products such as hats and shirts.

b$.$

He provided training and support to franchisees to ensure that quality would be consistent in every McDonalds restaurant.

c$.$

He sold franchises in competing territories to encourage franchise owners to compete and come up with new innovations for the company.

d$.$

He purchased prime real estate that would increase in value over time.