Without doing any calculations, determine the signs for Delta S for the system, for the surroundings, and ...?

Without doing any calculations, determine the signs for Delta S for the system, for the surroundings, and for the overall process in each of the following: (a) Ice forms on the surface of a birdbath in winter. (b) A hot cup of coffee cools when left to stand. (c) A Popsicle melts when left on a table.