The ornamental design for a bed, as shown and described.
The file of this patent contains at least one drawing/photograph execute in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a front, top, right side perspective view of a bed, showing my new design with the front, top, left side perspective view being identical thereto; and,
FIG. 2 is a top, right side perspective view thereof, with a top, left side perspective view being a mirror image thereof.