W = − 1 2 m + 16 Henry's water bottle is leaking at a constant rate. The amount of water, W, in ounces, that is left in the water bottle after leaking for mmm minutes is given by the equation above. What does the -1/2 mean in the equation?

Group of answer choices:

The water bottle loses 2 ounces of water per minute.

The water bottle loses 1/2 an ounce of water per minute.

The water bottle has 1/2 an ounce of water in it at the start.

1/2 of the water has leaked from the water bottle in one minute.