Buster was charged with murder. During his trial, he became unruly and seemed not to know what was going on around him. The judge ordered a mental capacity test. Which of the following is TRUE about this type of test?

a. It evaluates whether the defendant is able to understand the proceedings they are facing
b. It decides whether the defendant is not guilty of the crime
c. It decides whether the defendant will be put to death
d. It determines whether the defendant will have a jury trial