Final answer:
Raffinose and stachyose are oligosaccharides, not polysaccharides, while starch, glycogen, and dietary fiber (including cellulose) are polysaccharides.
Step-by-step explanation:
Among the options given, raffinose and stachyose are the only ones that are not polysaccharides; instead, they are oligosaccharides. Polysaccharides, such as starch, glycogen, and dietary fiber (which includes cellulose), are long chains of monosaccharides linked together. These include homopolysaccharides and are common in both plants and animals. Starch and glycogen are primarily energy storage polysaccharides in plants and animals respectively, whereas cellulose is a structural component of plant cell walls.