A solid copper cube,$$with a volume of $27000$ cm$3$ is suspended in a fluid.$$Conduction through the bottom surface of the cube is calculated to be $10$W$/$m$2.$ The axes are arranged as shown in the image. Which of the following statement$($s$)$ is correct?

a$.0\mathrm{.}9$ W is convected from the fluid to the bottom surface.

b$.9$ W enters the cube through the bottom surface.

c$.$ The temperature of the block is increasing with time.

d$.$ Heat leaves the cube through the bottom surface.

e$.$ Heat enters the cube through the bottom surface.