Keeping best practices in mind, what is a correct way to accomplish this?

An Adobe Commerce developer is asked to implement a 15% surcharge for all users from a Wholesale’ customer group.

Keeping best practices in mind, what is a correct way to accomplish this?
A . Create a Cart Price Rule that applies only to the "Wholesale’ group. Specify no conditions for the rule, and in the Actions section, specify for the rule to apply a "Percent of product price discount", with the Discount Amount’ field set to -15 .
B . Create an Observer to the catalog_product_get_final_price event. Check if the current customer is in the ‘Wholesale’ group, and if so. retrieve the product from the $product->setEvent() data and call
4product->set0ata(‘final_price’, $product->getData(‘final_price") ‘’ 1.15) .
C . Declare a new total collector class to calculate the modified total if the current user is in the group, register it in the module’s etc/sales.xml file, modify the checkout_cart_index.xmland checkout_index_index.xml layouts to include a new child in
the totals block.

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Answer: C