What statements are TRUE for a parcel of air that is in hydrostatic balance. Hint: there is more than one true statement below, so you will need to click on at least two statments. Group of answer choices   a. The gravitational force is exactly balanced by the vertical pressure gradient force   b. The vertical pressure gradient force is pushing the parcel downward   c. The parcel cannot be moving upward or downward   d. The parcel is neither positively or negatively buoyant   e. The gravitational force acting on the parcel of air is zero   f. The parcel of air is not accelerating upward

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