Coca-Cola's "the happiness machine"-a vending machine that gives out seemingly endless cans of Coca-Cola,plus surprise gifts such as bunches of flowers,balloon animals,pizzas,and giant sandwiches-is an example of ______.

A) entrepreneurial marketing
B) traditional marketing
C) guerrilla marketing
D) transactional marketing

"The happiness machine" is an example of guerrilla marketing, which involves creating unconventional and unexpected marketing campaigns to generate buzz and excitement around a brand or product. The surprise gifts and endless supply of Coca-Cola create a memorable and positive experience that is likely to be shared and talked about among consumers.