An ad campaign for a new snack chip will be conducted in a limited geographical area and can use TV time, radio time, and Internet ads. Information about each medium is shown below.

Medium	Cost Per Ad	# People Reached	Exposure Quality
TV	1,000	20,000	35
Radio	600	10,000	45
Internet	300	60,000	5

The number of Internet ads should be at least one third of all ads. Also, the advertising budget is $18,000. We would like to develop a model that will minimize the number of people reached while ensuring a minimum exposure quality of 300. Define the decision variables as follows:

Let T = the number of TV ads

Let R = the number of radio ads

Let I = the number of Internet ads

3. Which of the following represents the constraint for the number of Internet ads?

Group of answer choices

I <= T + R

I >= T + R

I >= (R + T)/2

I <= 2(R + T)

None of the choices.