Clay buys an MP3 player for $200 and a pair of stereo speakers for $600from a Discount City store, and downloads $300 worth of digital music from E-Music.com. To be enforceable, the contract that must be in writing is thepurchase ofa.the digital music, the MP3 player, and the speakers. b.the MP3 player and the speakers only. c.the MP3 player only. d.the speakers only