The collateral bar rule stands for which proposition? A journalist may choose to obey court orders only if he or she think they are constitutionally valid O A journalist must obey a court order, even an obviously unconstitutional gag order, until an appellate court overturns it O A journalist must obey court orders unless they violate the professional journalist code outlined by the SPJ O A journalist may violate a patently invalid gag order after making a good faith effort to get an appellate court to overturn it