Greg must meet with six of his team members before the end of the week: Allen, Becca, Carl, Daphne, Fred, and Jack. The following restrictions must be applied to his visits: Daphne and Allen are only available before Carl. Allen is only available before Becca. Carl is only available before Fred. Daphne and Carl are only available before Jack. If Becca is the fourth team member visited, who MUST be the third team member visited?