Which of the given statements is(are) true regarding the preparation of Gilman reagents?
◦ Gilman reagents can be made from aryl halides (Ar-X).
◦ Lithium halides are byproducts of the reaction to make Gilman reagents.
◦ Gilman reagents can be made from alkyl halides (R-X).
◦ Gilman reagents can be made from organolithium reagents.
◦ all of the above