Considering performance, where would the di .xml be added?

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When using the traditional Magento frontend, an Adobe Commerce developer is tasked to create a before plugin every time that the totals information loads on the cart page summary.

Considering performance, where would the di .xml be added?
A . etc/di.wni
B . etc/frontend/di.xml
C . etc/webapi_rest/di.xml

Answer: B