Final answer:
Platform framing is the type of framing where the studs run from the sill plate to the top plate of both the second and first floors, while the first floor joists also rest on this sill.
Step-by-step explanation:
The type of framing where the studs run from the sill plate to the top plate of both the second and first floors, while the first floor joists also rest on this sill, is called platform framing.