What should a solutions architect do to securely meet these requirements?

A company delivers files in Amazon S3 to certain users who do not have AWS credentials. These users must be given access for a limited lime.

What should a solutions architect do to securely meet these requirements?
A . Enable public access on an Amazon S3 bucket.
B . Generate a presigned URL to share with the users.
C . Encrypt files using AWS KMS and provide keys to the users.
D . Create and assign IAM roles that will grant GetObject permissions to the users.

Answer: B