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Which combination is most appropriate to enhance the confidentiality of sensitive data collected by agricultural IoT sensors?
①Protect device communications with TLS and apply envelope encryption using AWS KMS on the server side.
②Prioritize fast processing without encrypting the data, and encrypt it later if necessary.
③Reduce management costs by hard-coding cryptographic keys into device firmware.
④Develop and deploy a custom, unvetted cryptographic scheme.
⑤Communications are in plaintext, but because they are isolated on a physical network, encryption is unnecessary.