What Is the Difference Between Expansion Diffusion and Relocation Diffusion

What is the difference between expansion diffusion and relocation diffusion?

A) In the case of expansion diffusion, a phenomenon originates in an area, remains strong there, and spreads outward; in relocation diffusion, the phenomenon is carried by migrants to a distant location and diffuses from there.
B) In the case of relocation diffusion, a phenomenon originates in an area, remains strong there, and spreads outward; in expansion diffusion, the phenomenon is carried to a distant location and diffuses from there.
C) Relocation diffusion involves direct contact; expansion diffusion requires a mobile host that transmits the diffused innovations at different locales.
D) Expansion diffusion continues endlessly; relocation diffusion is a staged process affecting an even larger area in periodic waves.
E) Relocation diffusion requires mass communication such as television; expansion diffusion takes place by direct contact.