Which of the Following Is True Regarding Tools of Discovery

Which of the following is true regarding tools of discovery?

A) The only tool of discovery is interrogatories.
B) Depositions are the only tool of discovery available to plaintiffs, but defendants may use both interrogatories and depositions.
C) Summary motions, interrogatories, and depositions are tools of discovery available to all parties.
D) Interrogatories and depositions are tools of discovery available to all parties, but summary motions and requests to produce documents are not tools of discovery.
E) Interrogatories, depositions, and requests to produce documents are all tools of discovery available to all parties.