Can someone help me with this question AASP

You arrive at a crime scene in a high traffic area shortly after first responders have removed the victim. There are a number of bloody footprints at the scene. After ensuring that the scene is secured from further contamination, what is the most important step to take?

Group of answer choices

obtain the names of all medical personnel who had been at the site

obtain statements from witness

take photographs of all visible footprints

Search for more evidence