In a Pretrial Challenge to a Search Conducted Based on a Warrant

In a pretrial challenge to a search conducted based on a warrant, which of the following statements is true?

A) The warrant is presumed to have been issued on evidence that meets the probable cause standard.
B) The defendant challenging the warrant bears the burden of proving that the warrant lacked probable cause.
C) The burden of proof required for a defendant to demonstrate that a warrant lacked probable cause is the clear and convincing evidence standard.
D) All of the above are correct.
E) Only a and b are correct.