A company runs a cron job on an Amazon EC2 instance on a predefined schedule.The cron job calls a bash script that encrypts a 2 KB file.A security engineer creates an AWS Key Management Service (AWS KMS) CMK with a key policy.The key policy and the EC2 instance role have the necessary configuration for this job.
Which process should the bash script use to encrypt the file?
Use the aws kms encrypt command to encrypt the file by using the existing CMK.
Use the aws kms create-grant command to generate a grant for the existing CMK.
Use the aws kms encrypt command to generate a data key. Use the plaintext data key to encrypt the file.
Use the aws kms generate-data-key command to generate a data key. Use the encrypted data key to encrypt the file.