When DNA Evidence Is Presented in Court

When DNA evidence is presented in court:

A) only the technician who processed the DNA may testify in compliance with the Constitution's confrontation clause.
B) the defense is not allowed to cross-examine the prosecution's expert, but may present its own.
C) it is presented because it is mandatory that every accused person have all relevant DNA evidence presented at trial.
D) a simple data summary is sufficient because a thorough explanation would confuse many jurors.
E) none of the above