单选题 Assume that you are analyzing a plain vanilla interest rate swap with the following characteristics : Counterparty X Counterparty Y pay fixed rate 6% pay floating rate LIBOR + 0.5% receive floating rate LIBOR +0.5% receive fixed rate 6% Swap tenor: 10 years National principal: $1000000 LIBOR : 4.75% Which of the following is the first floating rate payment made by Counterparty Y?