the structure shown in the picture is made of copper. The three thin rods are of equal dimensions. The single main rod is heated to 400 °C and then is brought into contact with the rods P, Q, and R. After several minutes, the temperatures of rods P, Q, and R are recorded. Which option gives the correct values of the final temperatures of rods P, Q, and R? A) P = R < Q B) P = Q = R C) P = R > Q D) P = Q < R