Explanation:
The correct answer is D because Nearline storage is cost-effective for files accessed once a month, aligning with the team's needs. Object Lifecycle Management simplifies the transition process. Coldline storage (Option C) is less cost-effective for monthly access. Options A and B are inefficient as lifecycle management automates transitions without the need for Cloud Functions.
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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.