Which two options describe the purpose of any secondary success metric? (Choose two.)

Which two options describe the purpose of any secondary success metric? (Choose two.)
A . Give additional understanding to interpret gains/losses of primary success metric.
B . These metrics are only used to measure time on site and primary metrics.
C . These metrics are only used to evaluate which audiences best respond to experiences.
D . Ensure that primary success metric gain is not at the cost of secondary metrics.

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Answer: A,C