A solid object is submerged in water and is suspended by an elastic thread. Three forces act on the object: its weight $W$, the tension in the thread $T$, and an upward force $F$ exerted by the water. The force $F$ is directed upwards. Which equation is correct when the object is at rest?
- A$F + W = 0$
- B$F - T = 0$
- C$F - W - T = 0$
- D$F - W + T = 0$