Question: What function from the dplyr package can be used to create summaries of a variable at each level ( or setting ) of another variable

What function from the dplyr package can be used to create summaries of a variable at each level (or setting) of another variable (or variables)?
Select one:
a. group_by0
b. summarize_on0
c. across0
d. by0
What function from the dplyr package can be used

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