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What is the most efficient and secure method to implement a queuing system for high-volume trade processing in Google Cloud, utilizing a Python API while minimizing resource usage?
A
Develop an application running on a Compute Engine instance to make a push subscription to the Pub/Sub topic
B
Create an application that builds a queue in a NoSQL database.
C
Utilize Cloud Composer to subscribe to a Pub/Sub topic and execute the Python API.
D
Implement a Pub/Sub push subscription to trigger a Cloud Function that passes data to the Python API
