Which mechanism do you use?

A custom module needs to log all calls of MagentoCustomerApiAddressRepositoryInterface::save().

Which mechanism do you use?
A . An observer on the customer_address_repository_save event, which is automatically fired for every repository save
B . A proxy configured to intercept all calls to any public method and log them
C . An extension attribute configured in the extension_attributes.xml
D . A plugin declared for the save() method

Answer: D