(1) A party seeking to clarify the report of a single expert witness may ask questions of the single expert witness under this rule:
(a) within 7 days after a conference (if any) is held under rule 7.25; or
(b) if no conference is held under that rule--within 21 days after the party received the single expert witness's report.
(2) The questions must:
(a) be in writing and be put once only; and
(b) be only for the purpose of clarifying the single expert witness's report; and
(c) not be vexatious or oppressive, or require the single expert witness to undertake an unreasonable amount of work to answer.
(3) The party must give a copy of any questions to each other party.