How can this requirement be fulfilled?

When a user buys 10 units of product B, the user wants 1 unit of Product A to be automatically added to the cart.

How can this requirement be fulfilled?
A . Override the AllowCheckout method in ccrz.cc_api_CartExtension
B . Override the prepareForSave method in ccrz.cc_api_CartExtension
C . Override the preprocess method in ccrz.cc_api_CartExtension
D . Override the prepareToAdd method in ccrz.cc_api_CartExtension

View Answer

Answer: C