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Your data team is developing new machine learning models and generates several files daily, storing them in a regional bucket. They primarily access files from the last week but wish to retain all files for occasional monthly reference. What is the most efficient method to reduce storage costs?
A
Create a Cloud Function that triggers upon object addition to a bucket, checking file dates and moving them to Nearline storage if older than a week.
B
Create a Cloud Function that triggers upon object addition to a bucket, checking file dates and moving them to Coldline storage if older than a week.
C
Implement a lifecycle policy to transition objects older than a week to Coldline storage.
D
Implement a lifecycle policy to transition objects older than a week to Nearline storage.