Law enforcement officers are conducting a legal search for which a valid warrant was obtained.
While conducting the search, officers observe an item of evidence for an unrelated crime that was not included in the warrant. The item was clearly visible to the officers and immediately identified as evidence. What is the term used to describe how this evidence is admissible?

A. Plain view doctrine

B. Corpus delicti

C. Locard Exchange Principle

D. Ex Parte Order