$21\mathrm{.}2\mathrm{.}1.$ What is the difference between $$libel$$ and $$slander$?$

$21\mathrm{.}2\mathrm{.}1.$a$.$ Slander is oral defamation without excuse, while libel is defamation in written statements, pictures, images, etc.

$21\mathrm{.}2\mathrm{.}1.$b$.$ Libel and slander are terms that can be used interchangeably, as they both refer to oral defamation without any distinction.

$21\mathrm{.}2\mathrm{.}1.$c$.$ Libel specifically refers to oral defamation, while slander is defamation in written statements, pictures, images, etc.

$21\mathrm{.}2\mathrm{.}1.$d$.$ Both libel and slander are terms related to written defamation, and there is no difference between them in terms of the medium used for defamation.