The U.S. Supreme Court has held that a journalist may be forced to testify or identify a confidential source only if

A. here is a probable cause to believe the journalist has clearly relevant information regarding a specific probable violation of law.

B. the information cannot be obtained in some other way that doesn't so heavily infringe on the First Amendment.

C. there is a compelling and overriding interest in the information.

D. All of the above.