I think answer is option B. An Apex trigger that calls an @future method that allows callouts

Use Case: You need to send JSON payloads to an external system and receive resized images in return.
Trigger: This process should happen automatically when records are created or updated (e.g., when a product is added or image is uploaded).
@future(callout=true): Required because callouts can't be made directly inside triggers — you offload the callout to a future method that supports asynchronous processing and allows HTTP requests.
Supports JSON payloads and asynchronous behavior needed for integration.