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You are developing an e-commerce web application using App Engine standard environment with Memorystore for Redis. When a user logs in, the application caches their information (e.g., session, name, address, preferences) for quick retrieval during checkout.
During browser testing, you encounter a 502 Bad Gateway error and have identified that the application fails to connect to Memorystore. What is the cause of this error?
A
Your Memorystore for Redis instance was deployed without a public IP address.
B
You configured your Serverless VPC Access connector in a different region than your App Engine instance.
C
The firewall rule allowing a connection between App Engine and Memorystore was removed during an infrastructure update by the DevOps team.
D
You configured your application to use a Serverless VPC Access connector on a different subnet in a different availability zone than your App Engine instance.