How does the Compulsory Process Clause apply to the Sixth Amendment?

[] It defends the rights of citizens in court by allowing them to obtain and subpoena witnesses.
[] It defends the rights of citizens in court by requiring witnesses to testify in front of the accused.
[] It maintains the rights of citizens by ensuring they have access to free legal advice.
[] It protects citizens from false legal accusations.

[] It defends the rights of citizens in court by allowing them to obtain and subpoena witnesses.