Given those answer options, answer the question: "Looks good, Boys." Billy-Eye knew he had been taking a big chance leaving the final details for his sons to handle. He had not even visited the place all week. It was Friday, 5:30 PM--thirty minutes before the grand opening of Billy-Eye's Arcade and Dance Barn. The arcade room had been arranged nicely--although not the way Billy-Eye would have done it. But still, it was good. The two popcorn machines were ready to go. High school aged workers were ready to hand out bags of the stuff. The first group in the competition was warming up on the bandstand. A stand-alone blackboard to the right side of the drums had the name of the band written across it in white chalk: The Triangulators. Each band would be responsible for putting their name on that board. "Glad you like it, Daddy." Craig beamed. Finally, he had done something right. "So, what do you think? Will we have a full house tonight?" said Billy-Eye. "Sure," said Lenny with a naive smile. "Hopefully," said Craig. "They get in free, get to hear eleven bands, and get all the free popcorn and coke they want. I'm sure the kids have heard our radio ad." "Maybe we should have made the games free too," said Lenny. "Hey, we can't give everything away," said Billy-Eye. "We're only charging a quarter for the games as it is." He walked back out into the main hall. "Is the refrigerator all stocked up?" "Yes, Sir," said Craig. "It's loaded with frozen pizzas, hot dogs, and condiments. And we've got plenty of hot dogs buns and candy." "And the soda fountains?" "Ready to go." "And I see you got the ice machine set up." Billy-Eye smiled. "Great. I'm proud of you boys." According to the above context, answer the following question. Where was the ad for the grand opening?
A:
radio