Frank should creates an agenda and a list of rules to share before the debate begins.
<u>Explanation:</u>
An agenda is a plan of meeting activity in the request wherein in which they are to be taken up, beginning with the call to order and ending with adjournment. It, as a rule, incorporates at least one explicit things of business to be followed upon.
Since while driving a gathering exchange, a mediator ought to follow an arranged plan to every one of the members. Based on the principles of allowing the participants should behave and to carry on the debate.
The answer is a it’s the only one that truly makes sense
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