Which of the following about stripping are true?

a. Wire-coated dogs have hair follicles that strongly resist releasing hairs that are ready to be stripped.
b. Hand stripping is the manual removal of the outer/guard hairs of a dog's coat.
c. For many Herding breeds, the process of hand stripping replaces nature's historical process of "stripping" their coats with dirt, rocks, roots and branches.
d. All of the above