Choose the option that conforms most closely to Standard English usage.

Creativity in any field is regarded not only as valuable for itself but also as a service to the nation.

Creativity in any field is not regarded only as valuable on its own, but also as a service to the nation.

Creativity, in any field, is not only regarded as valuable, but also as a service to the nation.

Creativity in any field is regarded not only as valuable in itself but also as a service to the nation.