What is a John Doe Warrant? * a warrant against a DNA Fingerprint when the identify of the suspect is unknown
O a warrant for an known suspect when a DNA Fingerprint can not be obtained
a warrant issued against a suspect so that a DNA sample can be legally obtained
from him
a warrant issued against a suspect so that investigators can take a DNA sample
without the suspect knowing

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

real, smaller and upside-down.   so the answer should be b.

it would be kevlar ^^

answercollision;