You are developing an application that will allow clients to download a file from your website for a specific period of time. How should you design the application to complete this task while following Google-recommended best practices?

【单选题】
A Configure the application to send the file to the client as an email attachment
B Generate and assign a Cloud Storage-signed URL for the file. Make the URL available for the client to download.
C Create a temporary Cloud Storage bucket with time expiration specified, and give download permissions to the bucket. Copy the file, and send it to the client.
D Generate the HTTP cookies with time expiration specified. If the time is valid, copy the file from the Cloud Storage bucket, and make the file available for the client to download.

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