US D641210 S1
The ornamental design for a serving tray, as shown and described.
FIG. 1 is a right elevated perspective view of a serving tray of the present invention:
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a side view thereof.
The broken lines showing indicia in FIGS. 1 and 2 is included for the purpose of showing features on the serving tray that form no part of the claimed design.