A company is paying a local radio station to run its commercials. The cost for running commercials is a one-time campaign fee and also a per-second fee for the air time of each commercial. The cost can be modeled by the equation y = 250 + 100x, where x is seconds. What is the slope, and what does it represent? (1 point)

Group of answer choices

250; it represents the one-time campaign fee

100; it represents the per-second fee of air time

100; it represents the one-time campaign fee

250; it represents the per-second fee of air time