Which type of performance testing should a Solution Architect recommend for testing data at scale on this project?

Universal Containers (UC) is implementing a Salesforce B2B multi-cloud project with large volumes of data and daily transactions from multiple third-party systems via multiple integrations. UC is looking at transactions of more than 1 million records a week and, in higher seasons, 10 million records a week. UC has made the decision to get a full copy sandbox to use to test all of its third-party integrations across its multiple clouds. UC has also invested in MuleSoft and the Anypoint Platform as the single enterprise service bus for all of the third-party data going into Salesforce.

Which type of performance testing should a Solution Architect recommend for testing data at scale on this project?
A . Perform API load test against the full copy sandbox before go live.
B. Perform unit testing against the full copy sandbox codebase before go live in production.
C. Perform page load testing against production after go live.
D. Perform API load test against the partial copy sandbox before go live.

Answer: A