Exam Certified Einstein Analytics and Discovery Consultant topic 1 question 37 discussion

The Universal Containers Einstein Analytics team built a dashboard with two widgets:
1: List widget associated to the step “Type_2” and grouped by the dimension “Type” (multi-selection)
2: Pie chart widget associated to the step “Step_pie_3” and grouped by the dimension “Type”
The team wants to use bindings so any selection in the List widget will filter the Pie chart.
Additional notes:
* The steps use different datasets.
* Users should be able to choose more than one Type (multi-selection).
What is the right syntax for the binding?