What Is the Purpose of a Grand Jury

What is the purpose of a grand jury?

A) to have a set of citizens determine whether the accused is guilty or innocent
B) to have a set of citizens determine whether sufficient evidence is available to justify a trial
C) to review the decision of the trial court judge in capital or otherwise infamous cases
D) to determine whether a potential candidate will be allowed to run for office
E) to determine the sentence a convicted criminal should receive