What is the purpose of using a by clause with the stats command?

What is the purpose of using a by clause with the stats command?
A . To group the results by one or more fields.
B . To compute numerical statistics on each field.
C . To specify how the values in a list are delimited.
D . To partition the input data based on the split-by fields.

Answer: A

Explanation:

Reference: https://docs.splunk.com/Documentation/Splunk/7.2.6/SearchReference/Stats#1._Compare_the_difference_between_using_the_stats_and_chart_commands