What Is the Best Way to Achieve Optimal Back Lighting

What is the best way to achieve optimal back lighting?

A) have the active furniture (actually used by talent) as close to the scenic background as possible
B) have the active furniture at least 6 feet away from the scenic background
C) have talent work as close as possible to the background scenery
D) have the back lights shine straight down onto the talent
E) lower the back lights as much as possible