For the following goods state whether each falls in the category of private goods, mixed goods or public goods by employing the criteria of exclusivity and rivalry in consumption. Explain your...

For the following goods state whether each falls in the category of private goods, mixed goods or public goods by employing the criteria of exclusivity and rivalry in consumption. Explain your answers.

a. Cable TV

b. A piece of cheesecake

c. Grades in a class

d. Street lamps in Main Street, USA