Instead of prompting the user to select any countries in Europe, the report author wants to constrain the user to select one or more countries from the Northern Europe region. What kind of prompt should be used and how can this be achieved?
A. This is not possible because a prompt must always be populated with all members of a level.
B. Create a multi-select value prompt. Populate it using an expression on the [Northern Europe] member to retrieve its children on the country level.
C. Generate a prompt by creating an expression with aparameter on the crosstab edge:children([Northern Europe]->?Country?
D. Create a tree prompt, and populate it using an expression on the [Northern Europe] member to retrieve its children at the country level.
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