What is the purpose of using file in a custom theme?

An Adobe Commerce developer needs to add an icon to the "Add to cart" button within a custom theme. The custom theme is child theme of the Magento/blank theme.

What is the purpose of using file in a custom theme?
A . It is used to remove duplicated styling code located in a LESS file in both parent and child theme.
B. It is used to override any styling code located in a LESS file in parent theme with any styling code located in 3 LESS file in a child theme.
C. It is used to merge any styling code Located in a LESS file in parent theme with code in file in a child theme.

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Answer: C