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What is the most effective setup for ensuring end-to-end encryption for data-in-transit in a Spark application without significantly impacting performance?
A
Utilizing IPsec tunnels for network encryption at the infrastructure level.
B
Applying encryption within Spark using UDFs for encrypting and decrypting data.
C
Enabling SSL/TLS for all Spark communication channels and inter-node encryption.
D
Configuring Spark to use an external encryption service for all data transfers.
