MCPA-LEVEL1 Web TestEngine Demo

Q13 Single choice

A system API has a guaranteed SLA of 100 ms per request. The system API is deployed to a primary environment as well as to a disaster recovery (DR) environment, with different DNS names in each environment. An upstream process API invokes the system API and the main goal of this process API is to respond to client requests in the least possible time.
In what order should the system APIs be invoked, and what changes should be made in order to speed up the response time for requests from the process API?

A
In parallel, invoke the system API deployed to the primary environment and the system API deployed to the DR environment, and ONLY use the first response
B
In parallel, invoke the system API deployed to the primary environment and the system API deployed to the DR environment using a scatter-gather configured with a timeout, and then merge the responses
C
Invoke the system API deployed to the primary environment, and if it fails, invoke the system API deployed to the DR environment
D
Invoke ONLY the system API deployed to the primary environment, and add timeout and retry logic to avoid intermittent failures

MCPA-LEVEL1 Web TestEngine demo