Disjunctive Tasks are tasks where the performance of the entire team depends on the performance(s) of its best member(s). This means that the group's performance is often determined by the most skilled member just like the group's performance in the question depends on Layla's performance.
It is a group task, just like the one described in the question that invloves solving a complex problem, that is completed when a single solution or group member's recommendation is adopted by the group.
