Sink

FIG. 1 is a perspective view of a sink showing the new design according to an embodiment; FIG. 2 is a front view thereof, the rear right side and left side elevation view being substantially the same to the front view, the sole difference being no part of the sidewall is claimed in the rear, right side, and left side elevational view; FIG. 3 is a top plan view thereof; and, FIG. 4 is a bottom plan view thereof. The dash-dash type broken lines shown in the drawings are included for the purpose of showing environmental subject matter and illustrate non-claimed portions of the sink and form no part of the claimed design. The dot-dash type broken lines shown in the drawings illustrate boundaries of the claimed portions of the sink and form no part thereof.