Question: How would you group by a multi-index level? Question 20 options: data.groupby(key='index1').count() data.groupby(index='index1').count() data.groupby(['index1'], axis=0).count() data.groupby(level='index1').count()

How would you group by a multi-index level? Question 20 options: data.groupby(key='index1').count() data.groupby(index='index1').count() data.groupby(['index1'], axis=0).count() data.groupby(level='index1').count()

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