The reaction will generate an unequal mixture of stereoisomers because water prefers to attack the three-membered mercurinium ion from the front more than from the back.

The reaction will generate an unequal mixture of stereoisomers because water prefers to attack the three-membered mercurinium ion from the back more than from the front.

The reaction will generate an unequal mixture of stereoisomers because the (2R,3S) configuration is less stable than the (2S,3S) configuration.

The reaction will generate an equal mixture of stereoisomers because water can attack the most substituted carbon of the three-membered mercurinium ion from the front or back on equal chances.