Each of the following is a shadow casting principle EXCEPT one. Which one is the EXCEPTION? a. Object and image receptor should be perpendicular to each other. b. Object and image receptor should be...

Each of the following is a shadow casting principle EXCEPT one. Which one is the EXCEPTION?

a. Object and image receptor should be perpendicular to each other.

b. Object and image receptor should be as close as possible to each other.

c. Object should be as far as practical from the target (source of radiation).

d. Radiation should strike the object and image receptor perpendicularly.