(a) A respondent appearing before the Office of Administration may do so on their own behalf or may be represented by an attorney licensed to practice law in this Commonwealth or a legal intern certified by the Supreme Court of Pennsylvania. An appointing authority shall be represented by an attorney licensed to practice law in this Commonwealth or a legal intern certified by the Supreme Court of Pennsylvania. Attorneys and legal interns shall file with the Docket Clerk an entry of appearance with the Office of Administration.